(4x²y+5xy-7x)-(5x²y+4xy+x)求解

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(4x²y+5xy-7x)-(5x²y+4xy+x)求解
(4x²y+5xy-7x)-(5x²y+4xy+x)求解

(4x²y+5xy-7x)-(5x²y+4xy+x)求解
原式=4x²y+5xy-7x-5x²y-4xy-x=（4x²y-5x²y）+（5xy-4xy）-（7x+x）=-x²y+xy-8x