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七年级数学计算练习(张) 63y26y3y4 (7)1; (1)7(2x-1)-3(4x-1)=4(3x+2)-1 0.30.40.5 (2)11116(5y+1)+ 3(1-y)= 8(9y+1)+ 5(1-3y) (3)23[3(124x1)-412]=x+2 (4)3x1222x3x1; (5)3y1333y5y41462; (6)1.22x1.52.5x0.20.53x5412; (8)20%+(1-20%)(320-x)=320×40% (9)2x54x5x3; (10)3y3521225y. (11)1(x3)1222(x3) (12)5(x4)7(7x)9123(9x); (13)7(2x1)3(4x1)5(3x2)10; (14)yy1y2225; (15)52m67m34mm2m5426 (16)0.1x210.3x0.51.2. (17)111x29{7[5(34)6]8}1 (18)5x2y8,3xy7;(用代入法) (19)4x7y10,6x11y280.(用加减法) (20)x22(y1),2(x2)(y1)5; x1y2(21),34x3 4y33112. x(22)12xx 232 2x73(x1)(23)4x312 33x (24)21145x5 (25)已知3(5x2)54x6(x1), 化简:3x113x 本文来源:https://www.dywdw.cn/e196a1d44593daef5ef7ba0d4a7302768e996f32.html