已知m+n=-2,mn=3,求多項(xiàng)式2(mn+m)-【-(3n-mn)-m】的值
已知m+n=-2,mn=3,求多項(xiàng)式2(mn+m)-【-(3n-mn)-m】的值
數(shù)學(xué)人氣:264 ℃時(shí)間:2020-02-02 16:34:05
優(yōu)質(zhì)解答
2(mn+m)-【-(3n-mn)-m】=2mn+2m+3n-mn+m=3m+3n+mn=3(m+n)+mn=3x(-2)+3=-6+3=-3
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