5x(m-2)+4x(2-m),其中x=4,m=1

问题描述:

5x(m-2)+4x(2-m),其中x=4,m=1

5x(m-2)+4x(2-m)
=5xm-10+8x-4xm
=xm+8x-10
=4×1+8×4-10
=26
祝学习快乐!