x²-4x+2 x²+3x+1 3x²+3x-3 2x²-2x-1/2 把这四道
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x²-4x+2 x²+3x+1 3x²+3x-3 2x²-2x-1/2 把这四道题目 因式分解,
x²-4x+2=(x²-4x+4)-2=(x-2)²-2=(x-2+√2)(x-2-√2)
x²+3x+1=(x²+3x+9/4)-5/4=(x+3/2)²-5/4=(x+3/2+√5/2)(x+3/2-√5/2)
3x²+3x-3=3(x²+x+1/4)-15/4=3(x+1/2)²-15/4=3(x+1/2+√5/2)(x+1/2-√5/2)
2x²-2x-1/2=2(x²-x+1/4)-1=2(x-1/2)²-1=2(x-1/2+√2/2)(x-1/2-√2/2)
x²+3x+1=(x²+3x+9/4)-5/4=(x+3/2)²-5/4=(x+3/2+√5/2)(x+3/2-√5/2)
3x²+3x-3=3(x²+x+1/4)-15/4=3(x+1/2)²-15/4=3(x+1/2+√5/2)(x+1/2-√5/2)
2x²-2x-1/2=2(x²-x+1/4)-1=2(x-1/2)²-1=2(x-1/2+√2/2)(x-1/2-√2/2)
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
x²-4x+2 x²+3x+1 3x²+3x-3 2x²-2x-1/2 把这四道
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