已知3-X+2Y=0,则2X-4Y-3的值()
问题描述:
已知3-X+2Y=0,则2X-4Y-3的值()
答
3-X+2Y=0
X-2Y=3
2X-4Y-3
=2(X-2Y)-3
=2*3-3
=6-3
=3