[2x+4y-1=0,3x+2y-5=0]要有过程
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[2x+4y-1=0,3x+2y-5=0]要有过程[2x+4y-1=0,3x+2y-5=0]要有过程[2x+4y-1=0,3x+2y-5=0]要有过程3x+2y-5=0乘以26x+4y-10=02x+
[2x+4y-1=0,3x+2y-5=0]要有过程
[2x+4y-1=0,3x+2y-5=0]要有过程
[2x+4y-1=0,3x+2y-5=0]要有过程
3x+2y-5=0 乘以2
6x+4y-10=0
2x+4y-1=0两式相减
4x=9
x=9/4
2*(9/4)+4y-1=0
4y=7/2
y=7/8
2x+4y=1……(1)
3x+2y=5……(2)
(2)*2-(1):4x=9即X=9/4
代入(1)可得:Y=-7/8
2式*2-1式,得
4x-9=0
x=9/4代入1式,锝
y=-7/8
这种题必须画图!否则都是错误答案!
第一步:2x+4y=1 (1)
3x+2y=5 (2)
(1)式*3,(2)*2得:
6x+12y=3 (3)
6x+4y=10 (4)
(3)-(4)得:
8y=-7
y=-7/8
代入(1)得:
2x+4*(-7/8)=1
2x-3.5=1
2x=4.5
x=2.25
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