解一元二次方程的数学题
两题.都要用因式分解法
(1) X²+2X=9999 (9999=10000-1)
(2) X²+404X+1995=0
要写出过程.
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人气:240 ℃ 时间:2019-09-22 08:44:32
解答
(1) X²+2X=9999 (9999=10000-1)
x²+2x+1=10000
(x+1)²=10000
x+1=100 x+1=-100
x=99 ,x=-101
(2) (x+5)(x+399)=0
x=-5,x=-399
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