2(x-3)²=x²-9 ,(x-2)²=(2x+3)² ,2x+6=(x+3)² 用分解因式法!

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/17 14:41:09
2(x-3)²=x²-9,(x-2)²=(2x+3)²,2x+6=(x+3)²用分解因式法!2(x-3)²=x²-9,(x-2)&

2(x-3)²=x²-9 ,(x-2)²=(2x+3)² ,2x+6=(x+3)² 用分解因式法!
2(x-3)²=x²-9 ,(x-2)²=(2x+3)² ,2x+6=(x+3)² 用分解因式法!

2(x-3)²=x²-9 ,(x-2)²=(2x+3)² ,2x+6=(x+3)² 用分解因式法!
2(x-3)²=x²-9
2x²-12x+18=x²-9
x²-12x+27=0
(x-3)(x-9)=0
x1=3,x2=9
,(x-2)²=(2x+3)²
x²-4x+4=4x²+12x+9
3x²+16x+5=0
(3x+1)(x+5)
x1=-3分之1,x2=-5
,2x+6=(x+3)²
2x+6=x²+6x+9
x²+4x+3=0
(x+1)(x+3)=0
x1=-1,x2=-3
祝开心

2(x-3)²=x²-9 ,
2(x-3)²-x²+9=0
2(x-3)²-(x-3)(x+3)=0
(x-3)(2x-6+x+3)=0
(x-3)(3x+3)=0
x-3=0,3x+3=0
x=3,x=-1
(x-2)²=(2x+3)² ,
(x-2)²...

全部展开

2(x-3)²=x²-9 ,
2(x-3)²-x²+9=0
2(x-3)²-(x-3)(x+3)=0
(x-3)(2x-6+x+3)=0
(x-3)(3x+3)=0
x-3=0,3x+3=0
x=3,x=-1
(x-2)²=(2x+3)² ,
(x-2)²-(2x+3)² =0
(x-2+2x+3)(x-2-2x-3)=0
(3x+1)(-x-5)=0
3x+1=0,-x-5=0
x=-1/3,x=-5
2x+6=(x+3)²
2(x+3)-(x+3)²=0
(x+3)(2-x-3)=0
x+3=0,-x-1=0
x=-3,x=-1

收起