2(x+6)=(x+3)^2怎么算,
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2(x+6)=(x+3)^2怎么算,2(x+6)=(x+3)^2怎么算,2(x+6)=(x+3)^2怎么算,2(x²+12x+36)=x²+6x+92x²-24x+72-
2(x+6)=(x+3)^2怎么算,
2(x+6)=(x+3)^2怎么算,
2(x+6)=(x+3)^2怎么算,
2(x²+12x+36)=x²+6x+9
2x²-24x+72-x²-6x-9=0
x²-30x=-63
x²-30x+225=-63+225
(x-15)²=162
x-15=±9√2
x=15-9√2,x=15+9√2
求根公式
2x+12=x2+9+6x
x2+4x-12=0
x=(-4±√16+4*12)/2
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