因式分解4.题 帮帮我都做谢谢
1个回答
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(1)已做对。
(2)9x^2-12x+4=0
(3x-2)^2=0
x1=x2=2/3
(3) 4x^2-9=0
(2x+3)(2x-3)=0
x1=-3/2, x2=3/2.
(4) (x+2)^2=2x+4
(x+2)^2-2(x+2)=0
(x+2)(x+2-2)=0
x(x+2)=0
x1=0, x2=-2.
(5) (x-2)^2+3(x-2)=0
(x-2)(x-2+3)=0
(x-2)(x+1)=0
x1=2, x2=-1,
(6) 25(x+2)^2-30(x+2)+9=0
[5(x+2)-3]^2=0
(5x+7)^2=0
x1=x2==-7/5.
(2)9x^2-12x+4=0
(3x-2)^2=0
x1=x2=2/3
(3) 4x^2-9=0
(2x+3)(2x-3)=0
x1=-3/2, x2=3/2.
(4) (x+2)^2=2x+4
(x+2)^2-2(x+2)=0
(x+2)(x+2-2)=0
x(x+2)=0
x1=0, x2=-2.
(5) (x-2)^2+3(x-2)=0
(x-2)(x-2+3)=0
(x-2)(x+1)=0
x1=2, x2=-1,
(6) 25(x+2)^2-30(x+2)+9=0
[5(x+2)-3]^2=0
(5x+7)^2=0
x1=x2==-7/5.
追问
谢谢
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