求老师：解二元一次方程. 麻烦了,谢谢~1.63x=67x+162.81x-300=7x-43.x/3-2=x/64.-(x-1)=-1/2(x+1)5.11x二次方+4x-1-x二次方-4x-5

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• 求老师：解二元一次方程. 麻烦了,谢谢~1.63x=67x+162.81x-300=7x-43.x/3-2=x/64.-(x-1)=-1/2(x+1)5.11x二次方+4x-1-x二次方-4x-5
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