初中数学解二元一次方程组专项练习题 78.docx

1、初中数学解二元一次方程组专项练习题 78 2a4b17 5x5y13 2a5b17 2x3y18 7x9y 174 m7b20 6y4x 174 -7m2b8 5a2b10 5x7y-4 3a b18 4x8y2 x4y 10 0.5x0.8y0.1 3y x 10 0.4x0.6y3 6a5b14 2x5y12 9a2b6 2x5y5 6x3y 35 7m3b13 2y2x 35 -5m9b20 3a4b2 7x3y-2 8a9b17 2x4y-8 4x3y -3 0.5x0.8y2.6 5y2x -3 0.3x0.5y1.8 5a b7 6x5y11 6a7b1 7x3y11 3x8y 2

2、0 2m9b15 5y9x 20 -4m9b11 9a2b13 4x3y0 5a7b18 9x9y5 3x4y 52 0.7x0.2y0.4 y4x 52 0.7x0.6y1.5 5a8b16 x9y19 5a6b5 8x5y16 5x9y -10 m5b15 8y5x -10 -5m7b16 5a8b18 7x5y5 3a2b8 6x y-1 8x7y -3 0.7x0.8y0.7 5y3x -3 0.7x0.3y0.2 2a5b7 7x3y20 3a9b11 5x2y15 4x2y 39 3m2b22 6y x 39 -4m6b9 8a4b8 9x2y7 3a9b7 7x3y6 8x8y

3、145 0.5x0.2y0.2 5y7x 145 0.4x0.3y2.7 4a7b4 6x y17 8a4b9 x y15 4x y 17 m b19 8y8x 17 -6m8b23 a6b16 4x6y8 5a5b18 8x y-5 2x9y 55 0.7x0.3y0.6 3y x 55 0.2x0.2y0.2 8a8b17 3x y17 9a4b14 x3y4 5x2y 84 9m8b19 5y6x 84 -3m5b6 a9b14 3x4y5 3a2b11 6x5y4 9x8y 119 0.3x0.7y0.8 4y8x 119 0.4x0.4y0.8 7a9b11 8x3y1 9a5b1 6x6y20 4x2y 160 m4b29 2y9x 160 -9m3b5 2a b18 9x8y9 3a7b6 5x6y5 7x8y 9 0.6x0.9y3.1 8y5x 9 0.5x0.5y2.4 a3b20 3x5y14 a6b14 7x y1 4x6y 168 7m3b26 2y9x 168 -7m4b10 8a5b3 4x4y-9 6a6b4 9x7y-10 4x9y 167 0.4x0.9y2.9 5y x 167 0.4x0.8y3.1