二元一次聯立方程式 2/1X-4/3Y+3=0.......(1) X+0.5Y=0.......(2) 求X+Y=? 要有算式?

2019-03-04 8:19 pm
更新1:

2/1X-4/3Y+3=0.......(1) X+0.5Y=0.......(2) 求X+Y=? 要有算式

回答 (1)

2019-03-05 12:59 pm
2x-4y/3+3=0.......(1)
x+0.5y=0……........(2)
求x+y=?
Sol
(2x-4y/3+3)-2(x+0.5y)=0-2*0
2x-4y/3-2x-y=0
-7y/3=-3
y=3*(3/7)=9/7
x=-0.5y=-9/14
x+y=9/14


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