2(5x×2x+5×5x+2x×5)=40怎么算的,
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2(5x×2x+5×5x+2x×5)=40怎么算的,
![2(5x×2x+5×5x+2x×5)=40怎么算的,](/uploads/image/z/15978189-21-9.jpg?t=2%285x%C3%972x%2B5%C3%975x%2B2x%C3%975%29%3D40%E6%80%8E%E4%B9%88%E7%AE%97%E7%9A%84%2C)
2(5x×2x+5×5x+2x×5)=40
10x^2+25x+10x=20
2x^2+7x-4=0
(2x-1)(x+4)=0
x=1/2或x=-4
10x^2+25x+10x=20
2x^2+7x-4=0
(2x-1)(x+4)=0
x=1/2或x=-4
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