| 求未知数. (1)6:8=x:2.4 (2)x:5=0.3:0.5 (3)8:x=21. |
| (1)6:8=x:2.4, 8x=6×2.4, 8x÷8=6×0.3×8÷8, x=1.8; (2)x:5=0.3:0.5, 0.5x=0.3×5, 0.5x×2=0.3×5×2, x=0.3×(5×2), x=3; (3)8:x=21, 21x=8, 21x÷21=8÷21, x=
|
关注公众号回复:奥数答案
即可免费获得密码查看答案

(2)
=
(3)x:6=0.7:0.28(4)20:3=50:x
