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数学
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解方程 5X+5X+5X+5X+2X²=120
人气:251 ℃ 时间:2020-01-27 11:01:35
解答
2x²+20x=120
x²+10x=60
x²+10x+25=60+25
(x+5)²=85
x+5=±√85
x=-5-√85,x=-5+√85
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