(2x-1)²-9x²=0X为多少?
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(2x-1)²-9x²=0X为多少?
(2x-1)²-9x²=0
X为多少?
(2x-1)²-9x²=0X为多少?
原式=(2x-1+3x)×(2x-1-3x)=0
(5x-1)(-x-1)=0
5x-1=0或者-x-1=0
x=1/5或者x=-1