已知3-X+2Y=0,则2X-4Y-3的值()

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已知3-X+2Y=0,则2X-4Y-3的值()
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已知3-X+2Y=0,则2X-4Y-3的值()
已知3-X+2Y=0,则2X-4Y-3的值()

已知3-X+2Y=0,则2X-4Y-3的值()
3-X+2Y=0
X-2Y=3
2X-4Y-3
=2(X-2Y)-3
=2*3-3
=6-3
=3

3

3-X+2Y=0

X-2Y=3
2X-4Y=6
2X-4Y-3=3

x=3+2y 2(3+2y)-4y-3=6+4y-4y-3=3