1、5、计算。 1 1 1 12(15)10(15) 3 15 8 3 1 () (180)16(21) 7 4 4 6 4 6 ()75 51(3)3 5 3 5 6、合并同类项。2m(3m8) m(3m3d)(7dm) 2(4a10)9a 3(2b6)(7b2) 5(ab4a)(4a4b) 15(abc4a)5(3a4abc) 7(xy2z)(xy6z) 7(pqpr)(5pqpr) 7、解方程。7 x 1 x 0.8x0.95.25.4x 6 2 9 2 1 6x4x 6(x8)9(x2)12 5 6 1 1 (8x6)x3 4x9(20x)1 8 5 y1 y1 5 4x8.5(x8)5
2、2 5 1 2 (23x)(4x5) 5(5x7)17 8 7 4, 5 ,0 , 6.4 , 2.5 ,-10 ,2.1 8 9, 2.1 ,1 ,0.4 (1)-17与-1 (2)-4.5与-1.5 (3)|-7.4|与|-0.8| (4)与 (5)-18与|-4| (6)|-30.4|与|-4.2| 9 9 7 11 8 24(19)16(19) 3 12 6 4 2 () (72)8(12) 7 3 3 5 2 7 144 411(1)2 6 3 8 4y(4y2) y(9y7c)(6c6y) 6(9n4)7n 3(5x6)(6x7) 6(ab8a)(5a4b) 8(abc8a)5(9
3、a6abc) 5(xy7z)(xy4z) 3(pqpr)(7pqpr) x 0.7x0.43.74.3x 6 6 3 4 1 2x2x 8(x1)4(x1)20 9 6 1 3 (7x4)x5 7x5(2x)9 y2 y1 7 3x6.5(x6)25 2 6 (22x)(4x4) 4(4x6)16 6 3 5, 2 ,0 ,6.4 , 22 ,-2 ,2.5 4 6, 1.35 ,3 ,0.32 (1)-17与4 (2)-4.75与2.5 (3)|-9.8|与|-0.9| (4)与 (5)-10与|-8| (6)|-71.4|与|-6| 9 7 1 13 1 17(6)20(6) 9 15 1
4、 4 1 (102)10 3 3 3 1 5 1 36 29(4)2 3 4 3 5m(6m8) m(7m4q)(7q5m) 9(6m9)7m 8(3m9)(7m4) 3(ab5a)(5a5b) 15(abc9a)3(7a6abc) 4(xy4z)(xy7z) 9(pqpr)(7pqpr) 5 x 1 x 0.4x0.92.17.1x 6 6 9 8x7x 9(x5)3(x1)19 9 2 (3x1)x6 2x9(1x)2 4 5 y3 y1 7 5x5(x6)25 3 6 (33x)(3x3) 9(7x5)16 7 7 3, 2 ,0 ,5.6 , 10.5 ,-6 ,-5.8 2, 1.2
5、 ,2 ,0.32 (1)-16与-7 (2)-4.75与-0.5 (3)|-6.2|与|1.7| (4)与 (5)0与|-6| (6)|-3.7|与|-1.6| 4 3 5 11 7 2(5)29(5) 6 12 1 4 8 () (78)(3) 5 3 7 1 7 5 ()72 66(4)2 3 6 4 2b(2b1) 7b(6b4q)(4q4b) 6(2a6)9a 8(8a6)(7a1) 8(ab4a)(2a8b) 3(abc8a)9(2a7abc) 6(xy7z)(xy4z) 9(pqpr)(6pqpr) x 0.5x0.83.36.1x 3 4 3 8 1 3x3x 2(x6)6(x
6、6)1 7 9 (9x8)x5 6x3(10x)7 y2 y2 1 0.5x8.5(x6)20 4 5 (44x)(3x1) 3(7x8)13 9 7 1, 1.5 ,0 ,4 , 8 ,-2 ,-3.3 9, 3.1 ,1 ,0.08 (1)-14与2 (2)-2.5与-1.5 (3)|-8.8|与|3.1| (4)与 (5)10与|-2| (6)|-41.4|与|-7.2| 8 9 2 19(2)11(2) 6 1 9 (114)4(9) 5 6 8 4 7 7 240 315(5)2 5 8 6 7a(4a1) a(7a2s)(7s9a) 7(9s7)3s 8(5y3)(3y4) 8(ab
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