带分数的二元一次方程组X/50+Y/40=0.8 (1) X/X+Y=0.2 (2)
2019-04-13
带分数的二元一次方程组X/50+Y/40=0.8 (1) X/X+Y=0.2 (2)
优质解答
(1)两边乘200
4x+5y=160 (1)
(2)即x=0.2x+0.2y
两边乘5
5x=x+y
y=4x
代入(1)
4x+20x=160
x=20/3
y=4x=80/3
(1)两边乘200
4x+5y=160 (1)
(2)即x=0.2x+0.2y
两边乘5
5x=x+y
y=4x
代入(1)
4x+20x=160
x=20/3
y=4x=80/3