{3x-2y=2① 5x+4y=1② {3(x-1)=4(y-6)① 5(y-3)=3(x+5)②{x+y/2 减 x-y/3=6① 4(x+y)-5(x-y)=2② (用加减消元法解方程,急列~)
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{3x-2y=2①5x+4y=1②{3(x-1)=4(y-6)①5(y-3)=3(x+5)②{x+y/2减x-y/3=6①4(x+y)-5(x-y)=2②(用加减消元法解方程,急列~){3x-2y=2
{3x-2y=2① 5x+4y=1② {3(x-1)=4(y-6)① 5(y-3)=3(x+5)②{x+y/2 减 x-y/3=6① 4(x+y)-5(x-y)=2② (用加减消元法解方程,急列~)
{3x-2y=2① 5x+4y=1② {3(x-1)=4(y-6)① 5(y-3)=3(x+5)②
{x+y/2 减 x-y/3=6① 4(x+y)-5(x-y)=2② (用加减消元法解方程,急列~)
{3x-2y=2① 5x+4y=1② {3(x-1)=4(y-6)① 5(y-3)=3(x+5)②{x+y/2 减 x-y/3=6① 4(x+y)-5(x-y)=2② (用加减消元法解方程,急列~)
(1)①X2+②得:11x=5,x=5/11,y=-7/22
(2)化简得:3x-4y=-21①-3x+5y=30
①+②得:y=9,x=5
(3)化简得:5y/6=6①-x+9y=2②,y=36/5,x=-314/5