m+n=-2,mn=4,求2(mn-3m)-3(2n-mn)的值.
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m+n=-2,mn=4,求2(mn-3m)-3(2n-mn)的值.m+n=-2,mn=4,求2(mn-3m)-3(2n-mn)的值.m+n=-2,mn=4,求2(mn-3m)-3(2n-mn)的值.2
m+n=-2,mn=4,求2(mn-3m)-3(2n-mn)的值.
m+n=-2,mn=4,求2(mn-3m)-3(2n-mn)的值.
m+n=-2,mn=4,求2(mn-3m)-3(2n-mn)的值.
2(mn-3m)-3(2n-mn)
=2mn-6m-6n+3mn
=2mn+3mn-6(m+n)
=32
原式=2mn-6m-6n+3mn
=5mn-6(n+m)
=5×4-6×(-2)
=20+12=32
2(mn-3m)-3(2n-mn)
=2mn-6m-6n+3mn
=5mn-6(m+n)
将m+n=-2,mn=4代入
=20+12
=32
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