作业帮3mn-3/2m+5/6n-7/4m-9/2mn-13/3n化简再求值其中m=5,n=-3/2
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3mn-3/2m+5/6n-7/4m-9/2mn-13/3n化简再求值其中m=5,n=-3/2
3mn-3/2m+5/6n-7/4m-9/2mn-13/3n化简再求值其中m=5,n=-3/2
3mn-3/2m+5/6n-7/4m-9/2mn-13/3n化简再求值其中m=5,n=-3/2
原式=-3/2mn-13/4m-7/2n
=45/4-65/4+21/4
=1/4
3mn-3/2m+5/6n-7/4m-9/2mn-13/3n
=-3/2mn-13/4m-21/6n
=-3/2mn-13/4m-7/2n
=-1/4(6mn+13m+14n)
m=5，n=-3/2
原式=-1/4[6*5*（-3/2)+13*5+14*(-3/2)]
=-1/4(-45+45-21)
=21/4
m-n=7 mn=-5求(3m+5n+4mn)-(2n-4n+6mn)
(5mn-2m+3n)+(-7m-7mn)
(5mn-2m+3n)+(-7m-7mn)
先化简,再求值(3M-5M+4MN)-(2M-4N+6MN)
3mn-3/2m+5/6n-7/4m-9/2mn-13/3n化简再求值其中m=5,n=-3/2
（3m-5n+4mn)-(2m-4n+6mn)其中m-n=7,mn=－5
(3m-5n+4mn)-(2m-4n+6mn) mn=-5 m-n=7快帮我打答吧!谢谢了!
若m-n=7,mn=-5,求（3m-5n+4mn）-（2m-4n+6mn）的值.
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