已知x+4y=-1.xy=5,求(6xy+7y)+((8x-(5xy-y+6x))(())代表有中括号哦
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已知x+4y=-1.xy=5,求(6xy+7y)+((8x-(5xy-y+6x))(())代表有中括号哦
已知x+4y=-1.xy=5,求(6xy+7y)+((8x-(5xy-y+6x))
(())代表有中括号哦
已知x+4y=-1.xy=5,求(6xy+7y)+((8x-(5xy-y+6x))(())代表有中括号哦
原式=6xy+7y+8x-5xy+y-6x =xy+2(4y+x)=5-2=3
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已知x+4y=-1.xy=5.求代数式(6xy+7y)+[8x-(5xy-y+6x)]的值,
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