已知:m-n=-2/3,则7-3m+3n=
问题描述:
已知:m-n=-2/3,则7-3m+3n=
答
7-3m+3n
=7-3(m-n)
=7-(-2)
=7+2
=9
已知:m-n=-2/3,则7-3m+3n=
7-3m+3n
=7-3(m-n)
=7-(-2)
=7+2
=9