Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
\(\dfrac{36}{54}\) = \(\dfrac{36:18}{54:18}\) = \(\dfrac{2}{3}\)
\(\dfrac{28}{49}\) = \(\dfrac{28:7}{49:7}\) = \(\dfrac{4}{7}\)
\(\dfrac{48}{100}\) = \(\dfrac{48:4}{100:4}\) \(\dfrac{12}{25}\)
\(\dfrac{45}{81}\) = \(\dfrac{45:9}{81:9}\) = \(\dfrac{5}{9}\)
a, 1727 + [ 6993 : 111 + ( 848 - 95 ) ] x 4 - 2
= 1727 + [ 63 + 753 ] x 4 - 2
= 1727 + 816 x 4 - 2
= 1727 + 3264 - 2
= 4991 - 2
= 4989
b, 75/100 + 18/21 + 19/32 + 1/4 + 3/21 + 13/32
= 75/100 + 1/4 + ( 18/21 + 3/21 ) + ( 19/32 + 13/32 )
= 75/100 + 25/100 + 21/21 + 32/32
= 100/100 + 1 + 1
= 1 + 1 + 1 = 3
c, 4 2/5 + 5 6/9 + 2 3/4 + 3/5 + 1/3 + 1/4
= ( 4 2/5 + 3/5 ) + ( 2 3/4 + 1/4 ) + 5 6/9 + 1/3
= 5 + 3 + 5 6/9 + 3/9
= 5 + 3 + 6
= 8 + 6 = 14
d, 3/4 + 25/36 - ( 4/9 + 13/18 + 1/72 )
= 27/36 + 25/36 - ( 32/72 + 52/72 + 1/72 )
= 52/36 - ( 84/72 + 1/72 )
= 52/36 - 85/72
= 104/72 - 85/72
= 19/72
a ) 1 , 2 , 3 , 5 , 8 , 13 , ... , ...
Ta thấy : 3 = 1 + 2
5 = 2 + 3
8 = 3 + 5
15 = 5 + 8
Vậy 2 số tiếp theo là :
8 + 13 = 21
13 + 21 = 34
b ) 1 , 2 , 3 , 6 , 12 , 24 , ... , ....
Ta nhận thấy : 3 = 1 + 2
6 = 1 + 2 + 3
12 = 1 + 2 + 3 + 6
24 = 1 + 2 + 3 + 6 + 12
P/s : tự làm
2/25=.2../25 .27../36=3/4
3/.12..=9/36
15/27=5/..9..
..20..28=5/7
36/72=..1../2
\(\dfrac{2}{25}=\dfrac{2}{25}\)
\(\dfrac{27}{36}=\dfrac{3}{4}\)
\(\dfrac{3}{12}=\dfrac{9}{36}\)
\(\dfrac{15}{27}=\dfrac{5}{9}\)
\(\dfrac{20}{28}=\dfrac{5}{7}\)
\(\dfrac{36}{72}=\dfrac{1}{2}\)