因式分解(要有步骤)
4x^2-49y^2+a(2x-7y)81(X+Y)^2-121(m+n)^2x^4-1分之16y^4(x^2+y^2)^2-x^2y^2(2m-n)^2-(3m+2n)...
4x^2-49y^2+a(2x-7y)
81(X+Y)^2-121(m+n)^2
x^4-1分之16y^4
(x^2+y^2)^2-x^2y^2
(2m-n)^2-(3m+2n)^2 展开
81(X+Y)^2-121(m+n)^2
x^4-1分之16y^4
(x^2+y^2)^2-x^2y^2
(2m-n)^2-(3m+2n)^2 展开
2个回答
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4x^2-49y^2+a(2x-7y)=(2x-7y)(2x+7y)+a(2x-7y)=(2x-7y)(2x+7y+a)
81(X+Y)^2-121(m+n)^2=[9(x+y)-11(m+n)][9(x+y)+11(m+n)]=(9x+9y-11m-11n)(9x+9y+11m+11n)
x^4-1分之16y^4=(x²-1/4y²)(x²+1/4y²)=(x-1/2y)(x+1/2y)(x²+1/4y²)
(x^2+y^2)^2-x^2y^2=(x²+y²-xy)(x²+y²+xy)
(2m-n)^2-(3m+2n)^2=(2m-n-3m-2n)(2m-n+3m+2n)=(-m-3n)(5m+n) =-(m+3n)(5m+n)
81(X+Y)^2-121(m+n)^2=[9(x+y)-11(m+n)][9(x+y)+11(m+n)]=(9x+9y-11m-11n)(9x+9y+11m+11n)
x^4-1分之16y^4=(x²-1/4y²)(x²+1/4y²)=(x-1/2y)(x+1/2y)(x²+1/4y²)
(x^2+y^2)^2-x^2y^2=(x²+y²-xy)(x²+y²+xy)
(2m-n)^2-(3m+2n)^2=(2m-n-3m-2n)(2m-n+3m+2n)=(-m-3n)(5m+n) =-(m+3n)(5m+n)
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2011-10-17 · 知道合伙人教育行家
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4x^2-49y^2+a(2x-7y)
=(2x+7y)(2x-7y)+a(2x-7y)
=(2x-7y)(2x+7y+a)
81(X+Y)^2-121(m+n)^2
= (9(x+y)+11(m+n)) (9(x+y)-11(m+m))
= (9x+9y+11m+11n)(9x+9y-11m-11n)
x^4-1分之16y^4
=(x^2+1/4y^2)(x+1/2y)(x-1/2y)
(x^2+y^2)^2-x^2y^2
=(x^+y^2+xy)(x^2-y^2-xy)
(2m-n)^2-(3m+2n)^2
=((2m-n)+(3m+2n))((2m-n)-(3m+2n))
=(5m+n)(-m-3n)
=-(5m+n)9m+3n)
=(2x+7y)(2x-7y)+a(2x-7y)
=(2x-7y)(2x+7y+a)
81(X+Y)^2-121(m+n)^2
= (9(x+y)+11(m+n)) (9(x+y)-11(m+m))
= (9x+9y+11m+11n)(9x+9y-11m-11n)
x^4-1分之16y^4
=(x^2+1/4y^2)(x+1/2y)(x-1/2y)
(x^2+y^2)^2-x^2y^2
=(x^+y^2+xy)(x^2-y^2-xy)
(2m-n)^2-(3m+2n)^2
=((2m-n)+(3m+2n))((2m-n)-(3m+2n))
=(5m+n)(-m-3n)
=-(5m+n)9m+3n)
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