求未知数X: 2X-1/2=0.5 X+5/4X=27/16 2:(1-X)=4/5 0.36:X=1/10:4/9.

问题描述:

求未知数X:
2X-

1
2
=0.5                  
X+
5
4
X=
27
16

2:(1-X)=
4
5
   
0.36:X=
1
10
4
9

(1)2x-12=0.5,    2x-12+12=0.5+12,         2x÷2=1÷2,             x=0.5 (...