3x-2y=15,3y-2x=11 x= y=
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3x-2y=15,3y-2x=11 x= y=
3x-2y=15,3y-2x=11 x= y=
3x-2y=15,3y-2x=11 x= y=
x=13.4
y=17.6
由一式得到X=5+2/3Y
把X的代数式带入二式,可算出Y
然后再算出X
x= 67/5
y= 63/5
3x-2y=15 ->3x=2y+15 ->x=(2y-15)/3
3y-2x=3y-2(2y-15)/3=(9y-4y+30)/3=(5y+30)/3=11 ->5y+30=33 ->5y=3 ->y=3/5
x=(6/5-15)/3=2/5-5=-4.6
即x=4.6 y=0.6
x+y=26
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