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数学
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解二元一次方程组:3(x+y)-4(x-y)=4,x+y/2+x-y/6+1
x+y/2+x-y/6+1=1
人气:238 ℃ 时间:2019-08-20 07:04:46
解答
3(x+y)-4(x-y)=4,①
x+y/2+x-y/6=1 ,则3(x+y)+(x-y)=6②
②-①,得5(x-y)=2,解得x-y=2/5③
代入②,得x+y=28/15④
③+④,得2x=34/15,解得x=17/15
代入③,解得y=11/15
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