X2-X+1/4=0 x2+8x+15=0 2x2+5x+2=0 x2-5=4x 用配方法 2(x-3)2=x2-9用分解因式法
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X2-X+1/4=0x2+8x+15=02x2+5x+2=0x2-5=4x用配方法2(x-3)2=x2-9用分解因式法X2-X+1/4=0x2+8x+15=02x2+5x+2=0x2-5=4x用配方法
X2-X+1/4=0 x2+8x+15=0 2x2+5x+2=0 x2-5=4x 用配方法 2(x-3)2=x2-9用分解因式法
X2-X+1/4=0 x2+8x+15=0 2x2+5x+2=0 x2-5=4x 用配方法 2(x-3)2=x2-9用分解因式法
X2-X+1/4=0 x2+8x+15=0 2x2+5x+2=0 x2-5=4x 用配方法 2(x-3)2=x2-9用分解因式法
X²-X+1/4=0
(x-1/2)²=0
x=1/2
x²+8x+15=0
x²+8x+16=1
(x+4)²=1
x+4=±1
x=-3,或x=-5
2x²+5x+2=0
(2x+1)(x+2)=0
x=-1/2,或x=-2
x²-5=4x
x²-4x+4=9
(x-2)²=3²
x-2=±3
x=-5,或x=-1
2(x-3)²=x²-9
2(x-3)²-(x+3)(x-3)=0
(x-3)【(2x-6)-(x+3)】=0
(x-3)(x-9)=0
x=3,或x=9
已知x2-4x+1=0,求x2/(x2)2-3x2+1
x2-4x+1=0,则x+1/x=?x2+1/x2=?
x2-3x+1=0 x2/(x4-x2+1)
x2-5x+1=0则x2+x2/1
X2-X+1/4=0 x2+8x+15=0 2x2+5x+2=0 x2-5=4x 用配方法 2(x-3)2=x2-9用分解因式法
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