已知x-3y=2,则8-3x+9y的值是
问题描述:
已知x-3y=2,则8-3x+9y的值是
答
8-3x+9y
=8-3(x-3y)
=8-3×2
=2
已知x-3y=2,则8-3x+9y的值是
8-3x+9y
=8-3(x-3y)
=8-3×2
=2