1.49+14x+x²-y²2.a²+2ab+b²+2a+2b快(⊙o⊙)哦
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1.49+14x+x²-y²2.a²+2ab+b²+2a+2b快(⊙o⊙)哦1.49+14x+x²-y²2.a²+2ab+b&su
1.49+14x+x²-y²2.a²+2ab+b²+2a+2b快(⊙o⊙)哦
1.49+14x+x²-y²
2.a²+2ab+b²+2a+2b
快(⊙o⊙)哦
1.49+14x+x²-y²2.a²+2ab+b²+2a+2b快(⊙o⊙)哦
1.49+14x+x²-y²=(x+7)²-y²=(x+7+y)(x+7-y);
2.a²+2ab+b²+2a+2b=(a+b)(a+b)+2(a+b)=(a+b+2)(a+b)
(x+7-y)*(x+y+7)
(a+b)(a+b+2)
1.(x+7-y)(x+7+y)
2.(a+b+2)(a+b)
1.(x+7-y)(x+7+y)
2.(a+b+2)(a+b)
① 49+14x+x²-y²
=(x+7)²-y²
=(x+y+7)(x-y+7)
② a²+2ab+b²+2a+2b
=(a+b)²+2(a+b)
=(a+b)(a+b+2)
49+14x+x²-y²
-14x²y/3+x²y
一:(x²+1)y²-x²-1二:-49x²+14x-1+y²
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因式分解-49x²+14x-1+y²
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x²-7xy+12y²=0{x²+4xy+4y²=14