Question

[ngôi sao nhỏ]

b1]dien so thich hop 

a]8/ 12 = ? / 3                    b] ?/11 = 10/55                   c] ?/32 = 21/ 24                       d]6/15 = 18 /?                        e]?/9 = 4/36                       g] ?/13 = 121/143              h]?/8 = 40/64                      i] 1/6 = 7/?                               k] 5/9 = 40/?

b2] tim x

23/6 : x - 2/5 = 1/4

Answer 1

[ghost river]

8/12 = 2/3
1/9 = 4/36
5/9 = 40/72
2/11 = 10/55
28/32=21/24
6/15 = 18/45
11/13 = 121/143
5/8 = 40/64
1/6 = 7/42
Tìm x
\(\frac{23}{6}:x-\frac{2}{5}=\frac{1}{4}\)
\(\Rightarrow\frac{23}{6}:x=\frac{1}{4}+\frac{2}{5}=\frac{13}{20}\)
\(\Rightarrow x=\frac{23}{6}:\frac{13}{20}\)
\(\Rightarrow x=\frac{230}{39}\)