用因式分解解方程3x²+5x=0(2) (2a-1)²=0(3) (2x-5)²=9(4) 4x²-(x-1)²=0

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用因式分解解方程3x²+5x=0(2) (2a-1)²=0(3) (2x-5)²=9(4) 4x²-(x-1)²=0

用因式分解解方程3x²+5x=0(2) (2a-1)²=0(3) (2x-5)²=9(4) 4x²-(x-1)²=0
用因式分解解方程3x²+5x=0
(2) (2a-1)²=0
(3) (2x-5)²=9
(4) 4x²-(x-1)²=0

用因式分解解方程3x²+5x=0(2) (2a-1)²=0(3) (2x-5)²=9(4) 4x²-(x-1)²=0
3x²+5x=0
x(3x+5)=0
∴x=0 x=-5/3
(2a-1)²=0
2a-1=0
a=1/2
(2x-5)²=9
2x-5=3 2x-5=-3
x=4 x=1
(2x+x-1)(2x-x+1)=0
(3x-1)(x+1)=0
x=1/3 x=-1

3x²+5x=0
x(3x+5)=0
x=0 x=-5/3

(2) (2a-1)²=0
2a-1=0
a=1/2

(3) (2x-5)²=9
(2x-5)²-9=0
(2x-5+3)(2x-5-3)=0
x=1 x=4

(4) 4x²-(x-1)²=0
(2x+x-1)(2x-x+1)=0
x=1/3 x=-1