1.169(a+b)²-121(a-b)²2.(x-3)(x-5)+13.(2a-b)²+8ab4.y²-2y-x²+15.x³+3x²-4x-126.6x²+5x-47.(x²-2x)²+2(x²-2x)+18.(x²+3x+3)(x²+3x+5)+19.(m+n)²-4(m+n-1)
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1.169(a+b)²-121(a-b)²2.(x-3)(x-5)+13.(2a-b)²+8ab4.y²-2y-x²+15.x³+3x²-4x-126.6x²+5x-47.(x²-2x)²+2(x²-2x)+18.(x²+3x+3)(x²+3x+5)+19.(m+n)²-4(m+n-1)
1.169(a+b)²-121(a-b)²
2.(x-3)(x-5)+1
3.(2a-b)²+8ab
4.y²-2y-x²+1
5.x³+3x²-4x-12
6.6x²+5x-4
7.(x²-2x)²+2(x²-2x)+1
8.(x²+3x+3)(x²+3x+5)+1
9.(m+n)²-4(m+n-1)
1.169(a+b)²-121(a-b)²2.(x-3)(x-5)+13.(2a-b)²+8ab4.y²-2y-x²+15.x³+3x²-4x-126.6x²+5x-47.(x²-2x)²+2(x²-2x)+18.(x²+3x+3)(x²+3x+5)+19.(m+n)²-4(m+n-1)
1,(13a+13b+11a-11b)(13a+13b-11a+11b)=(24a+2b)(2a+24b)=4(12a+b)(a+12b)
2,x²-8x+15+1=x²-8x+16=(x-4)²
3,4a²-4ab+b²=8ab=4a²+4ab+b²=(2a+b)²
4,y²-2y+1-x²=(y-1)²-x²=(y-1+x)(y-1-x)
5,x²(x+3)-4(x+3)=(x+3)(x+2)(x-2)
6,(3x+4)(2x-1)
7,(x²-2x+1)²=(x-1)^4
8,(x²+3x+4)²
9,(m+n)²-4(m+n)+4=(m+n-2)²
1、169(a+b)²-121(a-b)²
=「13(a+b)」²-「11(a-b)」²
=(13a+13b+11a-11b)(13a+13b-11a+11b)
=(24a+2b)(24b+2a)
=4(12a+b)(12b+a)
2、(x-3)(x-5)+1
=X*X-8X+15+1
=X*X-8X...
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1、169(a+b)²-121(a-b)²
=「13(a+b)」²-「11(a-b)」²
=(13a+13b+11a-11b)(13a+13b-11a+11b)
=(24a+2b)(24b+2a)
=4(12a+b)(12b+a)
2、(x-3)(x-5)+1
=X*X-8X+15+1
=X*X-8X+16
=(X-4)²
3、(2a-b)²+8ab
=4a²-4ab+b²+8ab
=4a²+4ab+b²
=(2a+b)²
4、y²-2y-x²+1
=(y+x-1)(y-x-1)
很难 LZ给分1楼吧
收起
1.=[13(a+b)+12(a-b)][13(a+b)-12(a-b)]=(15a+b)(a+15b) 太简单了。
太麻烦了。到此为止。
1.4(12a+b)(a+12b)
2.(x-4)(x-4)
3.(2a+b)(2a+b)
4.(y-1+x)(y-1-x)
5.(x+3)(x+2)(x-2)
6.(2x-1)(3x+4)
7.(x-1)(x-1)(x-1)(x-1)
8.(x²+3x+4)²
9.(m+n-2)²