问题
解答题
|
答案
(1)
:x=3:16,5 8
3x=16×
,5 8
3x÷3=10÷3,
x=3
;1 3
(2)
=0.7:5,42 x
0.7x=42×5,
0.7x÷0.7=210÷0.7,
x=300;
(3)12.5%:0.25=150:x,
12.5%x=0.25×150,
12.5%x÷12.5%=37.5÷12.5%,
x=300;
(4)
=x 5
,25 40
40x=5×25,
40x÷40=125÷40,
x=3.125.