求未知数. 3/20:6=6.5x 3/4x-1.4=3.6+2/3x.
问题描述:
求未知数.
:6=3 20
6.5 x
x-1.4=3.6+3 4
x. 2 3
答
(1)
:6=3 20
,6.5 x
x=6×6.5,3 20
x=39,3 20
x×3 20
=39×20 3
,20 3
x=260;
(2)
x-1.4=3.6+3 4
x,2 3
x-1.4−3 4
x=3.6+2 3
x−2 3
x,2 3
x-1.4=3.6,1 12
x-1.4+1.4=3.6+1.4,1 12
x=5,1 12
x×12=5×12,1 12
x=60.