因式分解 过程
2(a²+b²)(a+b)²-(a²-b²)²4(1+2x-3y)+(3y-2x)²(x+y)&su...
2(a²+b²)(a+b)²-(a²-b²)²
4(1+2x-3y)+(3y-2x)²
(x+y)²-4(x+y-1)
3(a-2)²-(3a-2)+27(2-3a) 展开
4(1+2x-3y)+(3y-2x)²
(x+y)²-4(x+y-1)
3(a-2)²-(3a-2)+27(2-3a) 展开
3个回答
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1)2(a²+b²)(a+b)²-(a²-b²)²=2(a²+b²)(a+b)²-(a+b)²(a-b)²
=(a+b)²[2(a²+b²)-(a-b)²]
=(a+b)²(a²+2ab+b²)
=(a+b)^4
2)4(1+2x-3y)+(3y-2x)²=(2x-3y)²+4(2x-3y)+4
=(2x-3y+2) ²
3)(x+y)²-4(x+y-1)=(x+y)²-4(x+y)+4
=(x+y-2) ²
4) 如果原题没错, 3(a-2)²-(3a-2)+27(2-3a)=3a²-96a+68
你得去设3a²-96a+68=0解方程求得A1,A2,然后再分解为(a-A1)(a-A2)
如果3(a-2)²是(3a-2)²,那么
(3a-2)²-(3a-2)+27(2-3a)=(3a-2)²-(3a-2)-27(3a-2)
=(3a-2)(3a-2-1-27)
=(3a-2)(3a-30)
=(a+b)²[2(a²+b²)-(a-b)²]
=(a+b)²(a²+2ab+b²)
=(a+b)^4
2)4(1+2x-3y)+(3y-2x)²=(2x-3y)²+4(2x-3y)+4
=(2x-3y+2) ²
3)(x+y)²-4(x+y-1)=(x+y)²-4(x+y)+4
=(x+y-2) ²
4) 如果原题没错, 3(a-2)²-(3a-2)+27(2-3a)=3a²-96a+68
你得去设3a²-96a+68=0解方程求得A1,A2,然后再分解为(a-A1)(a-A2)
如果3(a-2)²是(3a-2)²,那么
(3a-2)²-(3a-2)+27(2-3a)=(3a-2)²-(3a-2)-27(3a-2)
=(3a-2)(3a-2-1-27)
=(3a-2)(3a-30)
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2(a²+b²)(a+b)²-(a²-b²)²
=2(a²+b²)(a+b)²-[(a-b)(a+b)]²
=2(a²+b²)(a+b)²-(a-b)²(a+b)²
=[2(a²+b²)-(a-b)²](a+b)²
=[2a²+2b²-(a²+b²-2ab)](a+b)²
=(a²+b²+2ab)(a+b)²
=(a+b)²(a+b)²
=(a+b)^4
4(1+2x-3y)+(3y-2x)²
=4+4(2x-3y)+(2x-3y)²
=(2x-3y+2)²
(x+y)²-4(x+y-1)
=(x+y)²-4(x+y)+4
=(x+y-2)²
3(a-2)²-(3a-2)+27(2-3a)
=3(a-2)²-(3a-2)-27(3a-2)
=3(a-2)²-28(3a-2)
=[3(a-2)-28](3a-2)
=[3a-6-28](3a-2)
=(3a-34)(3a-2)
=2(a²+b²)(a+b)²-[(a-b)(a+b)]²
=2(a²+b²)(a+b)²-(a-b)²(a+b)²
=[2(a²+b²)-(a-b)²](a+b)²
=[2a²+2b²-(a²+b²-2ab)](a+b)²
=(a²+b²+2ab)(a+b)²
=(a+b)²(a+b)²
=(a+b)^4
4(1+2x-3y)+(3y-2x)²
=4+4(2x-3y)+(2x-3y)²
=(2x-3y+2)²
(x+y)²-4(x+y-1)
=(x+y)²-4(x+y)+4
=(x+y-2)²
3(a-2)²-(3a-2)+27(2-3a)
=3(a-2)²-(3a-2)-27(3a-2)
=3(a-2)²-28(3a-2)
=[3(a-2)-28](3a-2)
=[3a-6-28](3a-2)
=(3a-34)(3a-2)
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①原式=(a+b)²[2a²+2b²-(a-b)²]
=(a+b)²(a²+b²+2ab)
=(a+b)^4
② 4(1+2x-3y)+(3y-2x)²
=4-4(3y-2x)+(3y-2x)²
=(2-3y+2x)²
③(x+y)²-4(x+y-1)
=(x+y)²-4(x+y)+4
=(x+y-2)²
④ (3a-2)²-(3a-2)+27(2-3a)
=(3a-2)(3a-2-1-27)
=3(3a-2)(a-10)
=(a+b)²(a²+b²+2ab)
=(a+b)^4
② 4(1+2x-3y)+(3y-2x)²
=4-4(3y-2x)+(3y-2x)²
=(2-3y+2x)²
③(x+y)²-4(x+y-1)
=(x+y)²-4(x+y)+4
=(x+y-2)²
④ (3a-2)²-(3a-2)+27(2-3a)
=(3a-2)(3a-2-1-27)
=3(3a-2)(a-10)
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