若2x-3y=5,求5-6x+9y的值
问题描述:
若2x-3y=5,求5-6x+9y的值
答
5-6x+9y
=5-3(2x-3y)
=5-3×5
=5-15
=-10
若2x-3y=5,求5-6x+9y的值
5-6x+9y
=5-3(2x-3y)
=5-3×5
=5-15
=-10