北师大版八年级数学下册解二元一次方程组练习题精选 14.docx

1、北师大版八年级数学下册解二元一次方程组练习题精选 14 7a b1 8x7y15 3a7b2 2x y20 7x7y 80 m b30 9y5x 80 -9m5b1 5a4b14 9x8y-9 4a6b1 3x5y7 2x7y 185 0.1x0.3y2.5 5y5x 185 0.6x0.2y2.1 5a6b8 x2y16 6a7b20 6x6y17 6x8y 175 9m b27 4y9x 175 -9m3b0 9a6b7 7x6y-4 2a5b4 3x6y-3 6x4y 186 0.6x0.3y1 4y9x 186 0.5x0.1y2 a5b7 5x7y1 6a6b7 4x8y9 5x y

2、 131 7m b16 y2x 131 -4m7b15 4a4b4 8x2y-5 2a2b12 8x2y-3 6x3y 95 0.5x0.8y3.2 6y x 95 0.2x0.4y2.7 2a8b7 8x4y6 3a b7 8x7y19 x9y 131 m7b6 9y3x 131 -8m5b22 8a8b15 9x y2 8a4b8 9x5y-10 x9y 157 0.3x0.7y2.2 2y x 157 0.8x0.3y0.6 2a b16 4x7y16 3a9b7 9x2y14 x6y 191 7m b3 3y8x 191 -9m2b15 3a5b18 7x7y10 2a2b11 3x9

3、y8 3x6y 35 0.2x0.3y2.2 6y5x 35 0.6x0.3y3.7 4a5b9 7x y17 8a5b6 4x8y12 6x3y 6 9m9b7 9y3x 6 -3m9b19 3a8b5 7x y1 5a3b15 7x8y10 6x8y 40 0.2x0.7y1.6 9y3x 40 0.9x0.3y3.7 7a2b4 9x5y16 5a9b10 2x3y12 3x4y 12 2m b6 8y3x 12 -10m9b11 9a2b17 7x2y-2 4a9b4 4x8y-10 8x8y 141 0.7x0.4y0.7 2y5x 141 0.4x0.4y1.3 8a7b8 4x9y19 2a b4 2x y20 9x6y 127 6m b25 3y4x 127 -9m8b23 a2b3 7x2y9 8a b8 8x2y8 5x7y 27 0.6x0.8y1 7y9x 27 0.2x0.8y3.4 9a9b14 2x6y15 6a5b8 3x9y12 5x9y 76 3m9b6 4y9x 76 -7m9b6 8a b4 2x9y7 5a8b19 5x4y-6 x y 80 0.5x0.6y0.9 3y2x 80 0.1x0.3y2.7