1.x+y/2+x-y/3=6, 4(x+y)-5(x-y)=2 求X,Y
来源:百度知道 编辑:UC知道 时间:2024/05/16 16:19:08
过程。2.4S+3T-5=0, 2S-T+5=0.
(x+y)/2+(x-y)/3=6
4(x+y)-5(x-y)=2
令:X+Y=T,X-Y=S,则:
T/2+S/3=6。。。。。(1)
4T-5S=2。。。。。。。。(2)
(1)*6:
3T+2S=36。。。。。(3)
(2)*2+(3)*5
23T=184
T=8
S=(36-3*8)/2=6
即:X+Y=8,X-Y=6
所以:X=(8+6)/2=7,Y=(8-6)/2=1
4S+3T-5=0,。。。。。。(1)
2S-T+5=0.。。。。。。。(2)
(1)+(2)*3:
10S=-10
S=-1
T=2*(-1)+5=3
4(x+y)-5(x-y)=2
4x+4y-5x+5y=2
x=9y-2
代入 1 得:
9y-2+y/2+9y-2-y/3=6
解得:
y=60/109
x=322/109
已知:X*X+Y*Y=34,X-Y=2,则X/Y=
(2x+y)(2x-y)-(3x-2y)(x+y)-y(2x-y)
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