(x+4y)(x-5y)等于多少?

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(x+4y)(x-5y)等于多少?(x+4y)(x-5y)等于多少?(x+4y)(x-5y)等于多少?(x+4y)(x-5y)=x²-5xy+4xy-20y²=x²-xy

(x+4y)(x-5y)等于多少?
(x+4y)(x-5y)等于多少?

(x+4y)(x-5y)等于多少?
(x+4y)(x-5y)
=x²-5xy+4xy-20y²
=x²-xy-20y²;
如果本题有什么不明白可以追问,

x^2-xy-20y^2

分别拆开括号
(x+4y)(x-5y)
=x*(x-5y)+4y*(x-5y)
=x²-5xy+4xy-20y²
=x²-xy-20y²;