已知x+2y=3.求代数式3-2x-4y的值
问题描述:
已知x+2y=3.求代数式3-2x-4y的值
答
=3-2(x+2y)
=3-2x3
=3-6
=-3
已知x+2y=3.求代数式3-2x-4y的值
=3-2(x+2y)
=3-2x3
=3-6
=-3