1、 5 3 5、计算。 1 13 1 25(16)20(16) 9 15 4 6 4 () (156)16(21) 3 5 5 1 5 5 ()252 120(2)3 7 6 6 6、合并同类项。9m(9m4) m(7m9s)(9sm) 5(5n2)4n 9(2y7)(4y5) 5(ab2a)(8a5b) 10(abc4a)5(5a3abc) 9(xy6z)(xy4z) 4(pqpr)(4pqpr) 7、解方程。7 x 1 x 0.3x0.47.13.9x 3 6 6 2 1 4x5x 6(x9)6(x4)1 7 6 1 4 (9x2)x4 2x4(16x)7 4 5 y3 y3 4 3.5x7
2、(x7)10 3 6 1 2 (23x)(5x5) 8(3x1)1 2 3 4, 4 ,0 ,6.4 , 12 ,-9 ,0.7 7 3, 3.1 ,9 ,0.24 (1)-19与6 (2)-4.5与1 (3)|-8.3|与|3| (4)与 (5)-9与|-4| (6)|-92.6|与|-0.9| 3 3 7 1 1 8(15)26(15) 6 15 7 6 3 () (180)2(24) 6 5 4 5 1 5 ()48 417(3)2 4 3 4 9m(7m2) m(9m6q)(6qm) 7(5b5)8b 10(2m3)(4m5) 6(ab2a)(5a3b) 16(abc3a)7(4a7a
3、bc) 5(xy8z)(xy5z) 2(pqpr)(7pqpr) x 0.9x0.49.50.2x 3 6 3 8 1 5x7x 9(x1)3(x8)14 3 9 (2x9)x2 9x4(11x)8 2 5 y1 y2 9 2.5x5(x1)10 2 5 (14x)(2x4) 9(4x3)20 8 9 4, 4.5 ,0 ,7.2 , 25 ,8 ,-0.3 4 1, 3.1 ,8 ,0.4 (1)-9与1 (2)-3.25与1.5 (3)|-4.5|与|-2.1| (4)与 (5)0与|-3| (6)|-23.6|与|-4.6| 5 5 5 13 8 9(4)27(4) 3 12 1 4 1
4、 () (144)18(9) 8 3 6 6 5 1 ()168 22(1)3 7 6 4 9b(3b7) b(3b4p)(4p7b) 7(7b8)9b 4(9x5)(7x4) 8(ab3a)(3a6b) 7(abc3a)2(7a3abc) 7(xy8z)(xy7z) 5(pqpr)(7pqpr) 5 x 1 x 0.4x0.14.37x 9 6 9 4 1 4x7x 6(x6)7(x3)17 3 3 1 1 (3x3)x5 2x6(14x)1 7 5 y3 y2 1 5x5.5(x4)50 (32x)(5x4) 4(6x1)6 6 7 5, 4 ,0 , 6.4 , 19 ,-15 ,-5.
5、9 9, 1.7 ,-3 , 0.24 (1)-11与4 (2)-5与0.75 (3)|-7.3|与|-3.7| (4)与 (5)0与|-7| (6)|-2.7|与|-5.7| 7 5 1 7 2 8(16)19 9 18 1 7 1 () (126)4(6) 5 8 4 7 1 6 200 911(4)3 8 5 5 7x(6x5) x(2x6d)(5dx) 2(6m2)5m 4(3x2)(9x3) 8(ab2a)(9a6b) 7(abc3a)2(8a3abc) 8(xy7z)(xy7z) 9(pqpr)(6pqpr) x 0.3x0.17.63x 9 2 9 4x1x 7(x3)4(x8)16 (7x8)x7 9x7(18x)9 8 5 y2 y3 5 0.5x6(x2)25 4 6 (43x)(2x2) 4(2x3)9 6 5 1, 2.5 ,0 , 2.4 , 5 ,11 ,-3.9 7, 1.35 ,0 ,0.8 (1)-19与0 (2)-5与-1 (3)|-9.7|与|-3.3| (4)与 (5)-10与|-1| (6)|-45.1|与|-0.2| 8 9 4 22(18)29(18) 6 18 6 1 6 4 5 5 5 7 7 1 ()384 38(3)3 8 8 6 6x(2x1) x(9x6q)(6q7x)
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