3mn-3/2m+5/6n-7/4m-9/2mn-13/3n化简再求值其中m=5,n=-3/2

问题描述:

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