Question

（2/5）X－（1－2/5）X/（1＋3/5）＝56 怎么解?

写明步骤

Answer 1

（2/5）X－（1－2/5）X/（1＋3/5）＝56
0.4X-0.4X/1.6=56,
0.4X-0.25X=56,
0.15X=56,
X=56/0.15
=56/(3/20)
=56*20/3
=1120/3.

Answer 2

（2/5）X－（1－2/5）X/（1＋3/5）＝56
(2/5)*x-3/5*x/(8/5)=56
(2/5)*x-(3/5)*(5/8)*x=56
(2/5)*x-(3/8)*x=56
(16/40)*x-(15/40)*x=56
(1/40)*x=56
x=56*40=2240

Answer 3

2/5*x-3/5*x/(8/5)=56
2/5*x-3/8*x=56
1/40*x=56
x=2240