1、 5 1 3 19(8)23(8) 3 15 1 9 4 () (60)16(9) 6 8 5 1 2 4 ()45 420(4)2 5 3 3 6、合并同类项。6y(9y2) y(7y7p)(7p8y) 3(2n10)6n 7(2n5)(2n9) 7(ab5a)(7a3b) 5(abc9a)2(3a5abc) 7(xy6z)(xy3z) 7(pqpr)(6pqpr) 7、解方程。7 x 1 x 0.8x0.54.47.9x 3 4 9 8 1 8x4x 6(x6)3(x8)16 3 7 1 3 (9x8)x4 2x6(4x)2 2 5 y2 y3 1 3.5x3(x1)30 2 5 1 2
2、(44x)(4x4) 2(9x4)9 3 3, 5 ,0 , 7.2 , 17 ,16 ,1.7 2 1, 1.4 ,1 , 0.08 7 (1)20与7 (2)3.5与2.5 (3)|4.8|与|1.1| (4)与 (5)3与|9| (6)|1|与|3.7| 7 9 1 1 8 15(19)24(19) 6 15 4 4 1 () (168)2(3) 5 3 7 4 3 1 ()84 95(3)3 3 4 7 3y(7y3) y(5y4c)(5cy) 9(7b1)2b 4(7y10)(5y5) 3(ab8a)(8a5b) 16(abc8a)9(6a3abc) 2(xy6z)(xy9z) 3(
3、pqpr)(9pqpr) 5 x 1 x 0.4x0.79.31.5x 6 2 9 4 1 7x2x 2(x4)6(x8)18 5 5 (4x1)x2 9x3(9x)2 8 5 y3 y3 1 4x8(x5)15 4 6 (44x)(4x5) 8(9x6)10 5 9 1, 1.5 ,0 ,3.2 , 23.5 ,16 ,9.7 8 4, 2.35 ,3 ,0.48 (1)9与0 (2)2.25与1.75 (3)|8.6|与|0.1| (4)与 (5)11与|3| (6)|12.4|与|6.4| 7 7 7 1 2 26(20)25(20) 6 12 1 5 6 (120)10(6) 6 6
4、5 4 8 6 ()175 111(2)3 5 7 5 6x(2x8) 9x(3x8z)(9zx) 4(3m9)3m 6(2a7)(5a1) 8(ab8a)(9a4b) 18(abc4a)4(6a4abc) 5(xy3z)(xy9z) 2(pqpr)(8pqpr) x 0.1x0.17.45.7x 9 8 9 2 1 7x3x 5(x7)2(x7)18 9 2 (6x6)x5 9x4(8x)8 3 5 y3 y3 1 2.5x0.5(x6)50 (23x)(3x1) 8(4x5)9 5, 1 ,0 ,4.8 , 7 ,9 ,1.4 4, 3.05 ,1 , 0.32 (1)17与7 (2)3.
5、5与1.5 (3)|8.3|与|3.4| (4)与 (5)13与|1| (6)|97.5|与|2| 7 3 7 9(1)24(1) 9 18 6 2 1 (156)12(24) 7 3 4 4 6 6 245 920(2)3 5 7 7 7x(2x6) 7x(2x4z)(2z3x) 6(8m3)4m 7(8n7)(6n6) 5(ab8a)(8a7b) 10(abc7a)3(9a2abc) 2(xy2z)(xy3z) 6(pqpr)(2pqpr) x 0.4x0.71.76.4x 3 6 9 7x7x 4(x8)7(x3)19 9 7 1 4 (9x7)x3 9x7(16x)3 y3 y2 6
6、3.5x8.5(x3)40 3 5 (53x)(2x4) 4(7x7)8 7 3 3, 5 ,0 , 1.6 , 17.5 ,2 ,1.7 7, 2.45 ,3 , 0.08 (1)17与1 (2)4.75与1.75 (3)|5.3|与|1.3| (4)与 (5)12与|8| (6)|4.1|与|1.7| 1 26(12)3(12) 5 1 1 (84)8(21) 6 7 5 8 4 9 168 214(3)2 7 3 8 8y(8y4) y(9y4c)(4c2y) 3(9n5)2n 1(5x2)(7x4) 4(ab9a)(9a5b) 6(abc4a)6(9a5abc) 8(xy4z)(xy6z) 9(pqpr)(3pqpr) x 0.1x0.49.74.9x 9 2 6 5x5x 4(x2)9(x5)9 3 6 (5x4)x7 5x2(18x)4 7 5 y2 y2 1 1x2.5(x7)20 3 6 (32x)(3x2) 6(8x6)7
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