已知x,y互為相反數(shù),且滿足x-2y=-3n,2x+y=4n+5,求n³的值
已知x,y互為相反數(shù),且滿足x-2y=-3n,2x+y=4n+5,求n³的值
數(shù)學(xué)人氣:166 ℃時間:2020-07-02 18:24:38
優(yōu)質(zhì)解答
x,y互為相反數(shù),則
y=-x
代人x-2y=-3n,2x+y=4n+5得
x+2x=-3n2x-x=4n+5
x=-n
x=4n+5
-n=4n+5
-5n=5
n=-1
n³的值為(-1)³=-1
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