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3x(x-1)=2-2x用分解因式.②2(x-3)^2=x^2-9③(4x+2)^2=x(2x+1)
题目详情
3x(x-1)=2-2x
用分解因式.
②2(x-3)^2=x^2-9
③(4x+2)^2=x(2x+1)
用分解因式.
②2(x-3)^2=x^2-9
③(4x+2)^2=x(2x+1)
▼优质解答
答案和解析
3x(x-1)=2-2x
3x(x-1)=-2(x-1)
3x(x-1)+2(x-1) =0
(x-1)(3x+2)=0
x1=-2/3,x2=1
②2(x-3)^2=x^2-9
2(x-3)^2=(x+3)(x-3)
2(x-3)^2-(x+3)(x-3)=0
(x-3)(2x-6-x-3)=0
(x-3)x-9)=0
x1=3,x2=9
③(4x+2)^2=x(2x+1)
4(2x+1)^2-x(2x+1)=0
(2x+1)(8x+4-x)=0
(2x+1)(7x+4)=0
x1=-4/7,x2=-1/2
3x(x-1)=-2(x-1)
3x(x-1)+2(x-1) =0
(x-1)(3x+2)=0
x1=-2/3,x2=1
②2(x-3)^2=x^2-9
2(x-3)^2=(x+3)(x-3)
2(x-3)^2-(x+3)(x-3)=0
(x-3)(2x-6-x-3)=0
(x-3)x-9)=0
x1=3,x2=9
③(4x+2)^2=x(2x+1)
4(2x+1)^2-x(2x+1)=0
(2x+1)(8x+4-x)=0
(2x+1)(7x+4)=0
x1=-4/7,x2=-1/2
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