人教版四年级数学下册小数加减法混合运算专项练习题49.docx
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人教版四年级数学下册小数加减法混合运算专项练习题49.docx
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人教版四年级数学下册小数加减法混合运算专项练习题49
一、口算。
9+0.8=7.1-1.3=0.6+0.07=6.5-0.8=
5.1-0.1=7.4-1.6=0.73-0.45=5.2+0.6=
4-0.2=6.2+2.5=0.78+0.2=6.1-0.5=
5.8-0.3=7.6-0.8=0.9+0.44=5.9-0.9=
6.7+0.5=6.8+4.4=0.89+0.4=7.3-0.1=
4.2-0.9=8.8+4.1=0.65+0.11=1.7-0.5=
2-0.5=6.5+1.2=0.62-0.08=5-0.1=
1.4-0.8=8.5+4.6=0.81-0.11=6.5+0.5=
二、混合运算。
0.88-0.17+3.69.9-0.15-4.8562.9+18+14
86.95+29.77+20.871.44+15.24+84.283.75+2.01-1.35
40-(6.78-0.1)76.5-(10.6-1.3)5.77-2.98-1.52
一、口算。
4.5-0.4=7.4+2.9=0.64+0.47=8.2-0.6=
1.9-0.6=6.2+0.4=0.85+0.43=4.1-0.1=
2.6+0.4=7.7+0.9=0.74+0.29=7.8+0.6=
6.3-0.1=9+3.1=0.6+0.44=4.2+0.3=
1.6+0.1=8.9-4=0.78-0.33=6+0.4=
2.8-0.6=8+1.6=0.72-0.09=1.6+0.3=
1.7-0.7=6.3-2.8=0.67-0.15=6.3+0.6=
3.3+0.3=7.9+2.9=0.77-0.15=3.5+0.5=
二、混合运算。
0.89-0.41+87.5-0.66-0.3447.1+11.4-17.7
60.87+46.39+73.6164.63+48.28+50.059.4+2.01+3.57
40-(1.62-0.67)67.8-(12.5+6)8.96-1.93+2.22
一、口算。
4.2-0.9=6+1.2=0.79+0.43=1.4+0.5=
2+0.7=6.5+4.9=0.64-0.12=3-0.7=
3.6+0.5=8.6+1.2=0.73-0.23=2+0.5=
5.3+0.8=6.4-2.9=0.8+0.01=4.4-0.9=
6.6+0.5=6.8-4.3=0.65-0.27=2.6-0.5=
1+0.6=7.1+0.5=0.87+0.05=3.5+0.7=
2.3-0.7=6-0.2=0.87+0.29=1.8+0.4=
3.7+0.9=6.6+4.4=0.72+0.03=1.5-0.8=
二、混合运算。
0.75+0.13+2.99.2-0.49-0.5184.5+32.5+27.8
72.16-14.06+27.1168.6+40.23+51.414.05-1.43-1.47
30-(2.77+0.82)94.7+(17.6-6.4)9.61+1.86-5.94
一、口算。
5.5+0.6=6.6+2=0.78-0.48=1.7+0.8=
6.5-0.5=6.8+3.3=0.68-0.06=2.3+0.4=
1.4-0.8=8.1+0.5=0.64-0.23=6.2-0.9=
5.8-0.5=6.3-0.3=0.62+0.29=3.9+0.1=
6.7+0.2=6.6+2=0.63-0.43=7.7+0.4=
3.7-0.7=7.6-0.1=0.71-0.41=4.6+0.3=
2.1+0.2=6.3+4.9=0.84-0.13=1-0.8=
2.6+0.3=6.2+3.8=0.88+0.11=3.4+0.8=
二、混合运算。
0.79+0.17+5.77.8-0.4-1.678.4+55.5-21.9
67.92-47.15+64.4171.01+47.14+34.429.15-6.36+1.08
50-(2.9-0.4)73.2-(16.1-1)6.72-2.94-1.17
一、口算。
4.5-0.8=6.3-3.2=0.75+0.4=8.8-0.8=
8.3-0.2=7.4+0.3=0.73-0.17=4.7+0.6=
4.6-0.6=6.2-4.7=0.9+0.44=8+0.2=
7.6-0.2=7.2+3=0.78-0.21=1.4-0.2=
8.6-0.5=6.5-1.8=0.83+0.15=2.5-0.3=
3.6+0.7=8.4+3.7=0.77+0.03=8.9+0.8=
2.4-0.5=7.7-4.2=0.8-0.48=2.1-0.8=
4.8-0.5=8-4.6=0.64+0.42=4.3+0.6=
二、混合运算。
0.81+0.38+8.19.7-0.79-2.2192.8+35.5+25.9
65.07-19.83+26.8887.85-23.09+21.028.54-6-1.45
60-(8.02+0.56)73.1+(29.3-6.6)8.31-3.84-3.24
一、口算。
4.3-0.2=7.7-3.2=0.71+0.28=7+0.6=
7-0.6=7.8+0.8=0.65-0.43=2.1-0.5=
2.5-0.3=6.3-4.5=0.77-0.19=6-0.9=
2.4+0.5=7.3+3=0.86+0.36=4.1-0.3=
3.9+0.6=8.8+2.8=0.7-0.13=8.9-0.6=
6.8-0.6=8.6-0.7=0.82-0.11=5.7+0.6=
7+0.1=6-3.8=0.82-0.18=5.9+0.2=
6.7+0.5=9+2.7=0.6-0.06=2.8+0.8=
二、混合运算。
0.63+0.15+55.4-0.7-1.379.1+34.2+13
67.45-14.02+52.3184.3-24.36+38.258.69+5.35-2.61
80-(4-0.46)97.3+(26.1+5.6)7.22+5.59+1.6
一、口算。
4+0.7=7.7+0.6=0.63-0.34=4.5+0.8=
3.4-0.2=7.7+1.4=0.65-0.03=6.9+0.2=
3.2+0.8=7.1-3.9=0.71-0.08=1.1+0.2=
4.1-0.7=7.2-3.3=0.82-0.41=5+0.8=
7.9-0.5=6.2+0.4=0.67+0.11=4-0.4=
5.3+0.5=8.1-3.8=0.87-0.32=7.7+0.8=
3.9-0.5=6.4+2.2=0.61-0.39=2.9+0.2=
7+0.2=7.8+2=0.64-0.06=4.4+0.8=
二、混合运算。
0.74+0.16+1.35.3-0.68-1.3273+19.5-52.5
81.98-47.23+59.6781.58+47.76+49.564.5-2.6-1.01
80-(7.25-0.92)69.7-(13.8-5.7)4.52-1.96-2.39
一、口算。
4.1+0.5=6.2-2=0.63+0.09=1+0.2=
7+0.4=6.9-4.3=0.89+0.09=2.3+0.5=
2.2-0.9=7-3.2=0.74+0.42=8.4+0.8=
1.8-0.9=6.6+3.4=0.81+0.49=8.2+0.1=
7.8-0.8=8.4+2=0.84+0.18=5.2+0.6=
3.9+0.7=8.1+0.7=0.63+0.01=2.2-0.7=
7.3-0.6=7.6-4.6=0.84-0.34=3.3-0.5=
1+0.6=6.1-4=0.64-0.09=6.1-0.8=
二、混合运算。
0.64+0.42+2.15.1-0.64-2.3680.7-56.4-15.5
60.75+13.61+79.9165.57+48.86+19.047.71+3.55-1.13
40-(4.12+0.98)87.1-(17.1+8.8)5.22-2.33-1.09
一、口算。
7.8-0.9=8.9+2.1=0.62+0.17=4.7+0.8=
7.7+0.7=6.4-4=0.84+0.28=7.8+0.4=
8.8-0.3=8.5-4.9=0.67-0.3=7.6-0.5=
6.6+0.8=6.6+1.5=0.67-0.44=8.2-0.4=
1-0.9=6-4.3=0.86+0.06=4.4-0.4=
4+0.8=6.8+2.7=0.77+0.08=1.2-0.2=
6.7+0.5=8.7+1.8=0.63+0.48=1.3-0.3=
8.6+0.7=6.5+0.8=0.76+0.49=2.8-0.8=
二、混合运算。
0.75+0.44+2.75.3-0.39-0.6155.9+37.7+14.9
68.58+11.66+70.1672.56+11.14+88.248.5-4.2-2.18
20-(2.35+0.49)83.4+(28+9.7)8.36+1.72-2.88
一、口算。
6.1-0.6=8.2-0.6=0.61-0.09=7.1-0.9=
5.9+0.3=7.3+4=0.84-0.43=2.3-0.7=
4.5-0.3=8.6-4.2=0.6+0.02=3.6+0.6=
8.7+0.7=8.4+4.4=0.7-0.39=2.6-0.5=
7.8-0.3=6.5-0.8=0.64+0.44=4.6+0.3=
3.8-0.3=7.1+3.2=0.81+0.36=4.4+0.5=
6+0.3=7+3.6=0.81-0.2=7.7-0.2=
2.7+0.2=8.4-4.2=0.63+0.17=5.9+0.5=
二、混合运算。
0.73+0.47+3.19.3-0.17-3.8396.9+19.2+42.6
86.62-29.62+69.575.98+48.41+81.183.66-1.69+1.9
80-(9.65-0.56)61+(23.8+4.1)9.06-1.98+1.29
一、口算。
7.3-0.8=9-3.4=0.78-0.26=2.2-0.3=
1.9+0.3=6.2-0.2=0.82-0.42=7+0.8=
2.8-0.4=6.7+3.2=0.77-0.32=7.7+0.1=
4-0.9=8.4+3.1=0.78+0.09=2.7+0.9=
3.6-0.6=7.2+3.2=0.67-0.21=2.8+0.3=
5.5+0.3=6.1-0.3=0.62+0.09=8.9-0.1=
1.1+0.5=8.2-1.9=0.85-0.04=6.8+0.6=
6.6+0.5=7.7+4.3=0.9+0.07=3.4-0.6=
二、混合运算。
0.87+0.21+7.59.9-0.58-4.4271.7-44.3+12.4
86.35-22.8+73.8371.38+20.76+81.794.47+1.4-3.06
60-(3.52-0.72)60.3+(15.4+5.1)6.85+2.35-2.16
一、口算。
6.8+0.5=7.2-4.2=0.6+0.13=1.9-0.8=
2.2-0.3=7.9+4.2=0.88-0.43=4.9-0.8=
2.4+0.3=6.1-4.8=0.8+0.47=7.4-0.1=
7.8-0.8=8.7-4=0.74+0.1=2.7-0.3=
5.4-0.5=8.1+4.5=0.69-0.33=4.3-0.4=
3.7-0.1=7.3-0.7=0.64+0.08=6.1-0.5=
4.6-0.2=7.2-4.7=0.84+0.09=5.2-0.4=
2.7+0.3=8.3+1.5=0.73-0.41=4.9-0.6=
二、混合运算。
0.9+0.21+8.19.8-0.71-0.2986.2+24.7-21.1
88.84-36.58+64.9472.42-13.45+90.699.67-1.56-7.71
20-(6.92-0.63)69.8-(20.1-9.2)6.28+2.95-2.77
一、口算。
1.9+0.3=6.6-4.1=0.76+0.41=8.6-0.6=
5.8+0.5=7.6-1.8=0.84-0.36=1.4+0.4=
6.4+0.5=7.1-2.2=0.64+0.01=2.8-0.4=
6.6+0.3=6.6-1.5=0.84+0.43=6.8+0.7=
6.3-0.4=6.2-4=0.65+0.29=7.8+0.4=
4.3+0.9=8.2+3.9=0.81-0.05=2-0.7=
8.5+0.4=7.3+4.4=0.82-0.23=4.8+0.1=
8.1-0.7=6.3-4=0.7-0.29=3.4+0.8=
二、混合运算。
0.68+0.07+3.28.7-0.23-0.7742.8+19.2+13.3
77.82+20.88+65.373.86+47.95+45.545.21+2.44-2.55
20-(8.82-0.94)98.2-(19.8+1.8)5.51-1.97-1.43
一、口算。
4.7-0.8=8.7-2.4=0.81+0.06=1.1-0.6=
2.5-0.2=7.3+2.8=0.77-0.46=6.4+0.4=
5.8-0.5=8.1+0.4=0.82+0.31=7.4-0.3=
6.5+0.3=8-3.9=0.9+0.41=3.4-0.1=
8.4+0.8=7.1+1.3=0.73-0.31=4.4+0.9=
4.7+0.1=8.5+0.3=0.71+0.37=6.2+0.3=
8+0.7=9+2=0.62+0.34=1.2-0.4=
3.1-0.5=7.8-0.8=0.89-0.1=1.6-0.4=
二、混合运算。
0.78-0.01+6.96.7-0.38-4.6286.9+28.2-55.1
73.49-28.17+81.2384.17-28.02+24.289.27+2.69-4.68
80-(8.53-0.58)70.9+(15.9-9.5)8.4-6.52-1.65
一、口算。
2.8-0.8=7.4-1.6=0.84+0.34=8.9-0.5=
6.1-0.3=9+1.3=0.64-0.33=5.4-0.2=
7.1+0.7=6.2+0.2=0.62+0.18=2.4-0.9=
1.9+0.4=7.7-4.6=0.61-0.16=8.9+0.9=
1.8+0.9=7.2+2.8=0.85+0.17=5+0.2=
3.2-0.7=8.4-1.1=0.82+0.26=4.9+0.3=
5.8+0.4=7-3.9=0.9-0.39=8.4+0.5=
1.4+0.3=8.1+3.8=0.85+0.31=3+0.3=
二、混合运算。
0.8+0.37+8.57.4-0.34-1.6691.4+34.9+54.3
62.95+45.26+75.9369.47-17.58+70.729.97+4.37+3.83
50-(6.13+0.77)65.2+(21.4+2.3)4.77+2.96-1.24
一、口算。
3.4+0.9=7.3-3=0.65-0.18=4.4+0.2=
4.9-0.8=8.5-1.8=0.68+0.19=8.2-0.8=
5.6-0.9=7.4+4.8=0.78+0.28=1.9+0.3=
5-0.8=8+4.9=0.62+0.29=1.8-0.1=
8.3-0.5=7.4+1.5=0.61+0.07=7.1+0.2=
2.3-0.7=6.7+0.3=0.68-0.15=6+0.9=
6.8+0.9=6.9-1.2=0.71-0.37=5.4+0.3=
1.4+0.7=7.4+0.6=0.88+0.14=4.6+0.7=
二、混合运算。
0.89+0.35+8.66.3-0.17-0.8339.4+10.6-17.5
72.11-33.85+62.1475.22-19.85+95.098.67-1.31-6.25
70-(7.88-0.93)82.9+(12.6+3.6)9.7-8.08+1.01
一、口算。
1.5+0.7=8.1+2.9=0.63-0.16=7-0.9=
4.8-0.6=8.1-0.9=0.61+0.3=9-0.7=
2.3+0.7=6+2.3=0.84+0.24=6.4-0.3=
2.9-0.2=6.1-1.2=0.68-0.31=7.9-0.8=
5.8-0.5=6.3-2.8=0.88-0.43=5.7+0.3=
3.1+0.5=6.1-1.9=0.76+0.12=1.9+0.8=
6.6+0.5=7.5+4.3=0.68+0.4=8.5-0.1=
1.1-0.3=6.9+3.9=0.71-0.22=4.1+0.5=
二、混合运算。
0.74+0.05+7.57.1-0.77-4.2343.1+16.6+10.6
80.95-27.34+10.273.89-10.63+30.064.32+1.62+1.96
70-(2.25+0.28)77.7+(26.1+2.2)8.45+1.63+1.26
一、口算。
1.7-0.8=6.6+1.3=0.71+0.49=4.6-0.3=
3.3-0.5=8.9-1.3=0.78-0.16=4.4+0.9=
1.9+0.5=8.5+4.3=0.79-0.19=
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