x-y=3分之1,则-3(y-x)=
问题描述:
x-y=3分之1,则-3(y-x)=
答
-3(y-x)
=3(x-y)
=3x(1/3)
=1
x-y=3分之1,则-3(y-x)=
-3(y-x)
=3(x-y)
=3x(1/3)
=1