2x²-5x+2=0怎么算?要因式分解法!
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2x²-5x+2=0怎么算?要因式分解法!
2x²-5x+2=0怎么算?要因式分解法!
2x²-5x+2=0怎么算?要因式分解法!
2x²-4x-x+2=0
2x(x-2)-(x-2)=0
(x-2)(2x-1)=0
x=2,x=1/2
koushawangzi ,你好:
2x²-5x+2=0
(2x-1)(X-2)=0
X1=1/2,X2=2
2x²-5x+2=0
(x-2)(2x-1)=0
x=2 或x=1/2
(2x-1)(x-2)=0
x=1/2
x=2
2x²-5x+2=0两边X2得
4x²-10x+4=0根据公式a²-2ab+b²=(a-b)²
(2x-5/2)²+4=5/2²
(2x-5/2)²=25/4-4=9/4
2x-5/2=3/2
2x=8/2=4
x=2
完