![](https://rs.olm.vn/images/avt/0.png?1311)
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Số thập phân 40,5 viết dưới dạng tỉ số phần trăm là :
A ) .40,5% B ) 405% C ) 4,05% D ) 0,456%
![](https://rs.olm.vn/images/avt/0.png?1311)
(1234567890+98765432110)+99999
=100000000000+99999
=100000099999
1234567890+(99999+98765432110)=1234567890+98765432110+99999=100000000000+99999=100000099999
![](https://rs.olm.vn/images/avt/0.png?1311)
1234567890 + 987654321 + 24682468 + 1357913579 = 3604818258
bn k ch mk nha
![](https://rs.olm.vn/images/avt/0.png?1311)
Lời giải:
$18,3-13,9-4,6=4,4-4,6$ (lớp 5 chưa học số bé trừ cho số lớn)
--------------------------------
$37,6+2,19+7,81+2,4=(37,6+2,4)+(2,19+7,81)$
$=40+10=50$
--------------------------------
$118,87-(18,17+40,5)=118,87-18,17-40,5=100,7-40,5=60,2$
-------------------------------
$2042,37-528,73-1042,27=(2042,37-1042,27)-528,73$
$=1000,1-528,73=471,37$
![](https://rs.olm.vn/images/avt/0.png?1311)
S = 1/3 + 1/9 +1/27 + 1/135 + 1/405
S = 135/405 + 45/405 + 15/405 + 3/405 + 1/405
S = \(\frac{135+45+15+3+1}{405}\)
S = \(\frac{199}{405}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
5/4 x 2007 x 0,8
= 1,25 x 2007 x 0,8
= (1,25 x 0,8) x 2007
= 1 x 2007
= 2007
![](https://rs.olm.vn/images/avt/0.png?1311)
a).(8505:27+850,5:270)x43-150,97
=(315+3,15) x43-150,97
= 318,15 x43-150,97
=13680,45-150,97
= 13529,48
b).(4,72+3,57x41+8,5x2,434)x100
=(4,72+146,37 +20,689 )X100
=171,779 X100
= 17177,9
= (405 : 270 - 405 : 270) x 1234567890 + 2007
= 0 x 1234567890 + 2007
= 0 + 2007 = 2007
k mk nha
\(\left(40,5\div27-405\div270\right)\times1234567890+2007\)
\(=\text{ }\left[\left(40,5\times10\right)\div\left(27\times10\right)-405\div270\right]\times1234567890+2007\)
\(=\left(405\div270-405\div270\right)\times1234567890+2007\)
\(=0\times1234567890+2007\)
\(=0+2007\)
\(=2007\)