已知2x+3y=1,求3-6x-9y的值
问题描述:
已知2x+3y=1,求3-6x-9y的值
答
3-6x-9y
=3-3(2x+3y)
=3-3×1
=3-3
=0
已知2x+3y=1,求3-6x-9y的值
3-6x-9y
=3-3(2x+3y)
=3-3×1
=3-3
=0