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-
=0.5 1 2
X+
X=5 4
27 16
2:(1-X)=
4 5
0.36:X=
:1 10
. 4 9
答
(1)2x-12=0.5, 2x-12+12=0.5+12, 2x÷2=1÷2, x=0.5 (...