方程组:二分之x+y+三分之x-y=13 三分之x+y-四分之x-y=3
方程组:二分之x+y+三分之x-y=13 三分之x+y-四分之x-y=3
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数学人气:348 ℃时间:2019-12-18 21:18:18
优质解答
二分之(x+y)+三分之(x-y)=13两边同时乘以6得:3(x+y)+2(x-y)=78=>y=78-5x .三分之x+y-四分之x-y=3两边同时乘以12得4(x+y)3(x-y)=18得y=18-7x,所以18-7x=78-5x得x=-30 y=228~
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