1、 7 9 5、计算。 1 11 9 26(9)30(9) 6 18 1 8 5 () (66)10 4 7 6 4 1 5 ()240 216(2)3 5 8 6 6、合并同类项。4m(2m6) 2m(8m7q)(3q7m) 6(8b1)8b 4(4b7)(8b6) 2(ab7a)(6a2b) 18(abc9a)4(3a3abc) 4(xy2z)(xy6z) 4(pqpr)(4pqpr) 7、解方程。7 x 1 x 0.7x0.23.10.7x 9 8 9 8 1 7x9x 3(x6)6(x8)10 3 3 1 1 (3x9)x7 9x8(1x)8 6 5 y1 y2 3 4x7(x4)15
2、2 6 1 2 (43x)(2x1) 8(4x1)9 5 7 5, 1 ,0 , 4.8 , 14.5 ,-3 ,4.4 1, 2.3 ,9 ,0.64 9 (1)-12与5 (2)-4.25与0.75 (3)|-6.9|与|2.1| (4)与 (5)-6与|-7| (6)|-11.2|与|-1| 5 7 7 13(2)25(2) 3 12 1 4 1 () (168)8(3) 3 5 5 5 7 9 256 67(3)3 4 8 8 3n(9n2) n(2n8p)(7pn) 2(7m5)7m 5(2x6)(5x1) 8(ab5a)(3a6b) 13(abc5a)6(7a4abc) 5(xy7
3、z)(xy7z) 3(pqpr)(7pqpr) 5 x 1 x 0.9x0.20.65.3x 6 8 6 4 1 7x4x 6(x2)9(x6)3 9 3 (5x7)x9 5x7(16x)6 5 5 y1 y1 7 3.5x7(x5)45 3 6 (43x)(2x4) 9(4x4)9 4, 1.5 ,0 , 0.8 , 17 ,10 ,-5.4 4, 3.35 ,-5 , 0.56 (1)-14与7 (2)-2.5与1.75 (3)|-6.3|与|-3.2| (4)与 (5)-7与|-4| (6)|-40.8|与|-4.6| 4 7 7 11 6 26(9)20 6 15 1 4 7 (180
4、)12(21) 4 3 6 1 8 8 ()245 35(1)2 5 7 7 2n(7n3) 5n(9n2z)(4z3n) 3(6m1)8m 9(7y5)(5y9) 5(ab7a)(4a2b) 5(abc4a)4(4a8abc) 4(xy2z)(xy9z) 4(pqpr)(2pqpr) x 0.6x0.86.69.7x 3 6 6 5x4x 2(x3)2(x4)5 7 7 1 3 (4x3)x1 4x9(18x)1 7 5 y2 y1 1 3x8.5(x7)45 (34x)(2x1) 7(6x5)16 9 5 5, 2.5 ,0 ,1.6 , 25 ,9 ,2.8 6 7, 4.75 ,-10
5、 ,0.64 (1)-12与2 (2)-3.25与0.25 (3)|-8.8|与|0.5| (4)与 (5)17与|-6| (6)|-33.7|与|-9.6| 9 7 2 15(12)3(12) 9 12 4 8 1 (120)2(27) 5 7 5 8 1 5 ()252 817(3)2 7 6 6 8x(9x8) 7x(7x4p)(2p8x) 7(5m10)5m 3(6a9)(9a6) 2(ab9a)(3a3b) 11(abc9a)5(6a7abc) 5(xy9z)(xy4z) 2(pqpr)(2pqpr) x 0.7x0.28.24.1x 9 8 6 2x2x 6(x2)9(x3)15 5 4 (7x3)x8 2x3(17x)1 y3 y1 3 5x8.5(x2)15 2 5 (53x)(3x1) 3(6x3)19 9 9 4 3, 0.5 ,0 ,0.8 , 13 ,18 ,-6.1 4, 4.7 ,1 , 0.32 (1)-9与0 (2)-4与0 (3)|-9.5|与|0.6| (4)与 (5)11与|-4| (6)|-97.9|与|-1.4| 2 9 1 13 2 1(9)26 8 6 5 (72)(18) 7 5 4 1 5 4 90 76(5)2 5 6 3 4a(3a3) a