8x+3y+2=0 4x+9=1-5y 解这个方程组
人气:109 ℃ 时间:2020-03-31 20:32:03
解答
解析:{ 8x+3y+2=0 (1) { 4x+9=1-5y (2)(2)式移项得:4x+5y+8=0 (3)(3)*2可得:8x+10y+16=0 (4)(4)-(1)可得:7y+14=0解得y=-2,代入(1)式得:8x-6+2=08x=4解得x=2分之1所以原不等式组的解为:{ x=2分之1{ y=-2...
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