1、 1 13 4 5(16)17(16) 9 18 8 5 5 () (114)14(24) 7 4 4 1 6 6 ()210 38(5)2 6 5 7 6、合并同类项。7n(7n4) 3n(7n5d)(2dn) 4(7a3)6a 9(9y8)(2y5) 5(ab3a)(4a2b) 20(abc5a)6(5a5abc) 3(xy2z)(xy9z) 7(pqpr)(3pqpr) 7、解方程。7 x 1 x 0.2x0.53.94.5x 3 8 9 8 1 8x4x 4(x5)8(x7)9 3 7 1 1 (4x2)x8 5x2(13x)6 2 5 y3 y1 3 1x0.5(x8)45 2 5
2、1 2 (14x)(2x5) 9(8x7)7 7 7 4 4, 4.5 ,0 , 1.6 , 13 ,10 ,9.6 8 2, 4.6 ,4 , 0.8 (1)16与2 (2)4.75与1.75 (3)|4.8|与|0.2| (4)与 (5)10与|1| (6)|22.4|与|8.9| 2 3 7 1 3 29(2)1(2) 6 12 1 2 1 (84)10(27) 5 3 5 1 1 4 ()36 615(1)3 3 4 3 2m(7m9) m(8m5s)(8sm) 7(3m7)6m 10(4a5)(2a10) 2(ab5a)(3a2b) 5(abc8a)4(5a3abc) 9(xy9z)
3、(xy2z) 7(pqpr)(6pqpr) x 0.8x0.746.4x 3 8 6 2 1 7x9x 7(x4)9(x6)7 5 2 (7x5)x9 5x5(19x)8 6 5 y3 y3 7 5x5.5(x5)5 3 5 (33x)(4x2) 2(5x9)3 4 5 3, 3 ,0 , 0.8 , 2 ,13 ,4.8 7, 3.6 ,1 ,0.24 9 (1)16与1 (2)2.25与1.75 (3)|5.2|与|3.5| (4)与 (5)7与|5| (6)|20.8|与|1.4| 9 9 7 7 2 18(18)20(18) 3 15 7 9 4 () (108)2(6) 8 8 3
4、5 3 7 128 97(4)2 4 4 8 2x(7x4) x(5x8d)(4dx) 2(4m4)8m 3(7n7)(3n7) 6(ab7a)(7a4b) 4(abc2a)3(4a2abc) 9(xy8z)(xy8z) 3(pqpr)(5pqpr) 5 x 1 x 0.4x0.10.97.3x 6 6 3 2x5x 3(x2)2(x4)17 3 4 (9x4)x1 2x7(8x)1 7 5 y3 y2 1 2x7(x5)10 3 6 (53x)(5x3) 8(6x4)17 2 7 1, 2 ,0 ,0.8 , 13.5 ,0 ,1.5 4, 0.2 ,8 , 0.16 (1)17与1 (2)
5、5与1 (3)|7.8|与|2.8| (4)与 (5)10与|4| (6)|46.6|与|1| 5 1 3 19(19)21(19) 3 12 1 5 4 (66)18(9) 8 6 5 7 4 2 ()54 310(3)3 6 3 3 3n(3n5) 3n(6n3d)(7d3n) 9(3a9)7a 4(4b6)(9b9) 5(ab7a)(2a2b) 19(abc2a)7(7a2abc) 7(xy2z)(xy2z) 7(pqpr)(6pqpr) x 0.8x0.94.12x 9 4 9 3x7x 5(x8)8(x4)4 1 4 (9x2)x5 4x2(16x)9 8 5 2 4.5x8.5(x
6、8)40 (34x)(4x3) 2(6x5)19 6 7 5, 4 ,0 ,4.8 , 6 ,18 ,6.1 5, 3 ,8 , 0.64 (1)9与8 (2)2.25与0.75 (3)|6.2|与|3.5| (4)与 (5)16与|5| (6)|92.6|与|5.4| 9 5 1 7 5 10(10)15(10) 6 18 5 3 6 4(15) 4 4 5 4 1 5 100 61(2)2 5 5 4 2n(2n4) 3n(3n9s)(9s2n) 4(4t5)4t 5(5m2)(5m1) 6(ab2a)(5a8b) 8(abc9a)4(6a9abc) 6(xy8z)(xy2z) 7(pqpr)(5pqpr) x 0.3x0.15.64.8x 9 8 6 4x3x 8(x7)8(x6)4 5 5 1 3 (7x1)x6 7x5(7x)4 y3 y1 6 0.5x8(x3)5 (14x)(3x3) 7(9x5)7 2 9
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