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3x-4y+2xy)--(2x--5y+5xy)=当x+y=5,xy=-3
题目详情
3x-4y+2xy)--(2x--5y+5xy)=当x+y=5,xy=-3
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答案和解析
(3x-4y+2xy)--(2x--5y+5xy)
=3x-4y+2xy-2x+5y-5xy
=x+y-3xy
=5-3*(-3)
=5+9
=14
=3x-4y+2xy-2x+5y-5xy
=x+y-3xy
=5-3*(-3)
=5+9
=14
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