问题
解答题
解比例. 4:16=9:X
|
答案
(1)4:16=9:x,
4x=9×16,
4x÷4=9×16÷4,
x=36;
(2)
:1 10
=x:1 2
,1 8
x=1 2
×1 10
,1 8
x×2=1 2
×2,1 80
x=
;1 40
(3)
=0.5 0.25
,0.2 X
0.5x=0.05,
0.5x÷0.5=0.05÷0.5,
x=0.1.
解比例. 4:16=9:X
|
(1)4:16=9:x,
4x=9×16,
4x÷4=9×16÷4,
x=36;
(2)
:1 10
=x:1 2
,1 8
x=1 2
×1 10
,1 8
x×2=1 2
×2,1 80
x=
;1 40
(3)
=0.5 0.25
,0.2 X
0.5x=0.05,
0.5x÷0.5=0.05÷0.5,
x=0.1.