1、7 20(16)25(16) 3 12 3 5 3 () (90)14(3) 4 6 4 7 6 1 ()280 320(3)2 8 5 7 6、合并同类项。7a(9a3) 3a(9a6q)(9q4a) 4(7a9)8a 8(5b7)(8b2) 3(ab5a)(4a5b) 2(abc5a)4(6a9abc) 9(xy6z)(xy7z) 7(pqpr)(3pqpr) 7、解方程。5 x 1 x 0.3x0.112.8x 9 6 9 2 1 8x9x 9(x1)7(x6)10 7 4 1 1 (9x7)x6 3x7(5x)8 7 5 y3 y3 5 1.5x2(x1)45 3 6 1 2 (14x
2、)(2x4) 6(3x1)18 9 3 5, 3.5 ,0 , 4.8 , 6 ,15 ,2.3 2 9, 4.1 ,3 , 0.24 (1)19与5 (2)4与1.25 (3)|6|与|3.1| (4)与 (5)7与|1| (6)|27.4|与|9.9| 5 5 1 7 5 15(9)26(9) 3 18 1 4 4 () (156)12(12) 3 3 5 7 4 1 120 41(2)2 6 5 4 3y(7y2) 9y(9y9q)(4qy) 6(2s10)2s 4(3x2)(9x3) 9(ab6a)(3a8b) 8(abc8a)9(5a3abc) 5(xy4z)(xy4z) 5(pqp
3、r)(2pqpr) x 0.1x0.19.30.3x 6 6 6 8 1 4x6x 5(x3)9(x8)20 9 7 1 4 (7x2)x6 7x7(2x)7 4 5 y2 y1 9 2.5x5.5(x1)10 2 5 (43x)(2x1) 5(9x6)7 4 7 4, 0.5 ,0 ,6.4 , 0.5 ,6 ,7.9 4, 1.65 ,2 , 0.48 (1)11与7 (2)4.25与1.25 (3)|5.4|与|0.7| (4)与 (5)16与|9| (6)|94.1|与|6.2| 8 7 7 13 5 29(7)9(7) 9 1 6 (66)6(6) 3 1 5 ()128 313(2
4、)2 4 8 4 5y(8y6) 9y(5y8s)(8sy) 5(7a1)3a 7(4a8)(7a5) 6(ab9a)(8a5b) 12(abc8a)9(8a2abc) 7(xy4z)(xy8z) 3(pqpr)(5pqpr) 7 x 1 x 0.4x0.82.53.2x 3 6 3 4 1 8x6x 7(x1)9(x6)1 5 8 (9x8)x7 9x8(4x)8 8 5 y1 y2 6 2x3(x3)30 2 6 (44x)(2x1) 7(8x2)13 5, 2 ,0 , 5.6 , 5.5 ,10 ,0.7 5, 2.8 ,9 ,0.32 9 (1)16与5 (2)4.25与2.5 (3
5、)|9.2|与|2.5| (4)与 (5)8与|1| (6)|64.6|与|2| 7 7 2 25(15)4(15) 9 18 6 5 1 (90)6 7 4 5 8 9 4 280 76(3)3 7 8 5 3m(5m3) 5m(9m2z)(3z7m) 6(4n3)6n 4(2x6)(3x5) 5(ab8a)(8a3b) 14(abc2a)4(4a8abc) 3(xy9z)(xy3z) 2(pqpr)(7pqpr) x 0.4x0.324.6x 3 8 6 8x9x 7(x9)7(x5)16 9 8 (8x1)x2 3x2(2x)3 6 5 y1 y1 4 1.5x8(x3)25 (44x)
6、(4x2) 4(3x1)9 6 3 2, 1.5 ,0 ,7.2 , 18.5 ,6 ,9.6 5, 2.35 ,4 ,0.72 (1)12与2 (2)2.75与1.5 (3)|5.5|与|3.3| (4)与 (5)11与|1| (6)|55.9|与|7| 4 9 5 13 3 13(5)17(5) 5 9 8 (60)8(18) 4 8 7 5 1 1 ()112 412(4)2 4 7 4 8a(7a4) a(9a5p)(8p3a) 2(5b8)9b 9(2x5)(3x4) 7(ab8a)(2a9b) 5(abc2a)5(9a6abc) 2(xy7z)(xy9z) 6(pqpr)(2pqpr) x 0.3x0.11.62x 6 6 3 9x8x 4(x5)9(x1)20 (8x2)x5 7x4(15x)2 2 5 y3 y2 9 1x4(x9)40 (33x)(5x3) 9(2x1)10 3 3
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