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(3x²+x-5)-(4-x+7x²)(8xy-3y²)-5xy-2(3xy-2x²)
题目详情
(3x²+x-5)-(4-x+7x²)
(8xy-3y²)-5xy-2(3xy-2x²)
(8xy-3y²)-5xy-2(3xy-2x²)
▼优质解答
答案和解析
第一个.原式=3x²+x-5-4+x-7x²
=-4x²+x-9
第二个.原式=8xy-3y²-5xy-6xy+4x²
=-3xy-3y²+4x²
=-4x²+x-9
第二个.原式=8xy-3y²-5xy-6xy+4x²
=-3xy-3y²+4x²
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