1、初中数学解二元一次方程组专项练习题 65 8a b14 7x9y16 5a7b5 7x7y3 5x2y 139 5m b30 9y3x 139 -3m3b16 3a7b18 3x2y-8 4a9b4 5x7y3 5x3y 50 0.4x0.7y3.3 8y7x 50 0.3x0.3y3 4a b20 6x8y12 9a2b5 7x y7 9x3y 19 3m6b4 2y9x 19 -10m7b26 2a3b20 8x4y3 4a8b15 2x4y3 3x3y 37 0.1x0.8y0.5 2y x 37 0.8x0.2y0.6 6a4b4 2x9y14 8a6b12 3x9y18 6x8y 1
2、08 2m3b1 2y8x 108 -10m9b11 3a3b4 2x y-1 8a7b15 3x4y5 x6y 20 0.7x0.6y2.4 4y7x 20 0.4x0.3y1.3 6a8b14 7x6y11 8a b3 8x3y6 3x7y 61 6m6b24 8y5x 61 -5m4b3 7a5b16 5x y7 5a8b11 8x y-1 8x2y 39 0.9x0.3y1.9 9y x 39 0.5x0.6y2.2 9a9b1 6x3y17 9a4b11 x5y19 3x8y 122 2m2b28 4y8x 122 -7m4b6 2a2b10 4x6y-10 8a9b6 9x4y0
3、2x2y -5 0.9x0.6y1 2y8x -5 0.9x0.9y0.8 6a b11 4x4y12 8a3b2 6x3y5 8x7y 101 5m3b1 4y7x 101 -1m b14 6a b11 4x5y-6 2a7b14 6x5y8 x8y -2 0.2x0.1y1.8 8y2x -2 0.5x0.3y0.4 7a4b8 8x9y7 9a6b6 9x4y17 8x6y -7 9m2b28 7y5x -7 -5m7b6 9a b15 3x9y-6 3a2b16 7x7y-5 5x y 136 0.1x0.1y0.4 8y8x 136 0.3x0.7y2.7 3a5b14 6x7y2 2a9b10 4x4y18 4x6y 114 2m6b24 y x 114 -8m7b16 7a6b10 2x4y10 5a3b12 5x y8 8x6y 39 0.1x0.6y0.6 4y x 39 0.4x0.3y3.1 4a7b12 4x6y17 9a5b19 8x6y10 6x5y 65 4m4b7 4y x 65 -8m3b14 8a2b1 5x5y3 4a9b16 9x5y4 5x2y 58 0.2x0.2y1.1 7y x 58 0.2x0.5y3.3