1、5、计算。 1 1 8 25(20)29(20) 9 12 7 1 7 () (90)8(21) 8 4 8 6 5 1 ()224 315(4)3 7 4 8 6、合并同类项。5n(3n1) 8n(9n3d)(7dn) 4(2a4)2a 10(7b1)(4b4) 5(ab4a)(6a8b) 6(abc8a)6(7a3abc) 3(xy8z)(xy5z) 7(pqpr)(2pqpr) 7、解方程。7 x 1 x 0.1x0.55.38.3x 3 8 9 8 1 2x6x 3(x7)2(x3)15 7 4 1 2 (5x3)x8 5x5(15x)8 7 5 y3 y1 9 4.5x6(x7)45
2、 3 6 (52x)(3x3) 3(6x6)4 9 5 1, 4 ,0 , 2.4 , 23 ,19 ,6 4 4, 4.35 ,9 ,0.08 (1)14与2 (2)4与0.5 (3)|4.8|与|2.1| (4)与 (5)2与|1| (6)|91.1|与|3.2| 4 3 5 13 1 20(8)17(8) 3 12 5 1 1 (96)18(9) 4 4 8 9 7 1 ()384 418(1)2 8 8 6 6m(3m2) m(2m4c)(7c4m) 7(4t10)9t 9(2a3)(4a6) 8(ab5a)(9a3b) 5(abc4a)5(6a6abc) 6(xy9z)(xy9z)
3、6(pqpr)(5pqpr) x 0.9x0.12.70.9x 4 1 9x2x 8(x6)4(x3)15 5 7 (4x8)x3 3x9(8x)3 3 5 y2 y1 3 2x1(x7)20 4 6 (32x)(2x5) 7(7x6)18 3 9 2, 5 ,0 ,2.4 , 6 ,13 ,9.6 5, 1.7 ,6 ,0.8 (1)18与8 (2)3.25与2.25 (3)|4|与|2.1| (4)与 (5)2与|2| (6)|37.4|与|9.9| 8 9 7 1 9 21(18)4(18) 6 15 1 6 1 (60)12 6 5 8 5 5 1 ()120 414(5)3 6 4
4、5 9a(9a9) 6a(4a4d)(5d6a) 2(6b4)9b 3(8y7)(7y6) 7(ab4a)(7a2b) 17(abc8a)7(9a2abc) 7(xy9z)(xy9z) 3(pqpr)(5pqpr) 5 x 1 x 0.9x0.59.68x 9 2 3 4x3x 2(x2)5(x3)15 3 7 1 3 (3x5)x2 2x5(16x)6 y2 y3 3 0.5x8.5(x7)30 4 5 (44x)(2x2) 9(7x6)9 5 5 5, 5 ,0 , 4 , 2.5 ,3 ,0.3 4, 4.45 ,10 ,0.24 (1)10与8 (2)4.25与0.5 (3)|8.1|
5、与|0.4| (4)与 (5)7与|1| (6)|29.1|与|5.3| 8 7 5 1 8 30(2)23(2) 3 18 () (162)10 4 4 4 8 1 3 224 510(1)3 7 8 4 6y(6y2) 8y(6y3s)(4s2y) 2(3s5)3s 10(5x1)(2x8) 6(ab7a)(9a3b) 11(abc8a)5(9a4abc) 6(xy5z)(xy3z) 2(pqpr)(5pqpr) x 0.9x0.416.7x 3 8 3 8x5x 7(x4)7(x5)13 7 9 1 4 (5x4)x1 7x6(7x)1 y3 y2 4 4x2(x5)35 (33x)(2
6、x4) 9(7x9)14 1, 2 ,0 , 1.6 , 24.5 ,1 ,0.5 2, 1.15 ,8 ,0.72 (1)16与8 (2)4.5与1.5 (3)|9.5|与|3.4| (4)与 (5)6与|10| (6)|53.6|与|3.3| 2 9 7 13 1 12(14)7(14) 9 18 1 1 7 () (150)16(27) 1 4 8 ()245 210(5)2 7 5 7 3y(8y8) 8y(8y4s)(3s3y) 6(9m10)7m 7(9n3)(3n7) 9(ab7a)(2a4b) 20(abc3a)5(9a2abc) 5(xy4z)(xy9z) 7(pqpr)(5pqpr) x 0.8x0.835.9x 3 2 3 5x3x 4(x1)9(x5)16 (9x1)x1 4x9(1x)2 2 5 y1 y2 5 3x10(x7)20 2 5 (12x)(2x4) 3(5x6)4 3 3
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