解方程组0.4x+0.3y=2.4 x-3/3 =y+6/5

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解方程组0.4x+0.3y=2.4x-3/3=y+6/5解方程组0.4x+0.3y=2.4x-3/3=y+6/5解方程组0.4x+0.3y=2.4x-3/3=y+6/50.4x+0.3y=2.4两边乘

解方程组0.4x+0.3y=2.4 x-3/3 =y+6/5
解方程组0.4x+0.3y=2.4 x-3/3 =y+6/5

解方程组0.4x+0.3y=2.4 x-3/3 =y+6/5
0.4x+0.3y=2.4
两边乘10
4x+3y=24 (1)
(x-3)/3=(y+6)/5
所以5(x-3)=3(y+6)
5x-15=3y+18
5x-3y=-33 (2)
(1)+(2)
9x=-9
x=-1
y=(33+5x)/3=28/3