因式分解(5a-b)^2-6(5a-b)(a-3b)+9(a-3b)^2(要过程)还有已知x^2+2x=1,且2ax^2+4ax-12=0,那么a^2+2a的值为_______(要过程)因式分解:5(x-2)^3(y-2)-3(2-y)^2(2-y)(要过程)第三题错了,应该是5(x-2)^2(y-2)-3(2-x)^2(
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![因式分解(5a-b)^2-6(5a-b)(a-3b)+9(a-3b)^2(要过程)还有已知x^2+2x=1,且2ax^2+4ax-12=0,那么a^2+2a的值为_______(要过程)因式分解:5(x-2)^3(y-2)-3(2-y)^2(2-y)(要过程)第三题错了,应该是5(x-2)^2(y-2)-3(2-x)^2(](/uploads/image/z/3761361-9-1.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%285a-b%29%5E2-6%285a-b%29%28a-3b%29%2B9%28a-3b%29%5E2%28%E8%A6%81%E8%BF%87%E7%A8%8B%EF%BC%89%E8%BF%98%E6%9C%89%E5%B7%B2%E7%9F%A5x%5E2%2B2x%3D1%2C%E4%B8%942ax%5E2%2B4ax-12%3D0%2C%E9%82%A3%E4%B9%88a%5E2%2B2a%E7%9A%84%E5%80%BC%E4%B8%BA_______%28%E8%A6%81%E8%BF%87%E7%A8%8B%EF%BC%89%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%9A5%EF%BC%88x-2%29%5E3%28y-2%29-3%282-y%29%5E2%282-y%29%EF%BC%88%E8%A6%81%E8%BF%87%E7%A8%8B%EF%BC%89%E7%AC%AC%E4%B8%89%E9%A2%98%E9%94%99%E4%BA%86%EF%BC%8C%E5%BA%94%E8%AF%A5%E6%98%AF5%EF%BC%88x-2%EF%BC%89%5E2%28y-2%29-3%282-x%29%5E2%28)
因式分解(5a-b)^2-6(5a-b)(a-3b)+9(a-3b)^2(要过程)还有已知x^2+2x=1,且2ax^2+4ax-12=0,那么a^2+2a的值为_______(要过程)因式分解:5(x-2)^3(y-2)-3(2-y)^2(2-y)(要过程)第三题错了,应该是5(x-2)^2(y-2)-3(2-x)^2(
因式分解(5a-b)^2-6(5a-b)(a-3b)+9(a-3b)^2(要过程)
还有
已知x^2+2x=1,且2ax^2+4ax-12=0,那么a^2+2a的值为_______(要过程)
因式分解:5(x-2)^3(y-2)-3(2-y)^2(2-y)(要过程)
第三题错了,应该是5(x-2)^2(y-2)-3(2-x)^2(2-y)
因式分解(5a-b)^2-6(5a-b)(a-3b)+9(a-3b)^2(要过程)还有已知x^2+2x=1,且2ax^2+4ax-12=0,那么a^2+2a的值为_______(要过程)因式分解:5(x-2)^3(y-2)-3(2-y)^2(2-y)(要过程)第三题错了,应该是5(x-2)^2(y-2)-3(2-x)^2(
(1)
(5a-b)^2-6(5a-b)(a-3b)+9(a-3b)^2
=(5a-b)^2-2*(5a-b)3(a-3b)+[3(a-3b)]^2
=[(5a-b)-3(a-3b)]^2
=(2a+8b)^2
(2)
x^2+2x=1,
2ax^2+4ax-12
=2a(x^2+2x)-12
=2a-12=0
a=6
a^2+2a=6^2+2*6=36+12=48
(3)
5(x-2)^2(y-2)-3(2-x)^2(2-y)
=5(x-2)^2(y-2)+3(x-2)^2(y-2)
=8(y-2)(x-2)^2
(1)
(5a-b)^2-6(5a-b)(a-3b)+9(a-3b)^2
let x=5a-b, y=a-3b
(5a-b)^2-6(5a-b)(a-3b)+9(a-3b)^2=x^2 -6xy +9y^2 =(x-3y)^2 = (2a+8b)^2
=4(a+4b)^2
(2)
0=2ax^2+4ax-12 =2a(x^2+2x) -12 =2a-12
a=6
a^2+2a =48
(3)
5(x-2)^2 (y-2)-3(2-x)^2(2-y)= 5(x-2)^2 (y-2)+ 3(x-2)^2 (y-2)= 8(x-2)^2 (y-2)
哥只想说你令x=5a-b,y=a-3b,试试!很简单