Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a/ 525.5:225+|-125|
=525.5:225+125
=525.51:225+53
=525+1-25+3
=54
b/232:[315-(230+8)]
=232:[315-230-8]
=232:77
= phần b đề sai
c/(-1732)+7376-(-1998)+(-2546)
=-1732+7376+1998-2546
=7642-2546
=5096.
a ) 525 . 5 : 525 + l - 125 l
= 525 . 51 : 525 + 125
= 525+1-25+3
= 54
12.25+29.25+59.25
=25.(12+29+59)
=25.100
=2500.
\(9\frac{7}{25}+\frac{3}{25}\cdot\frac{7}{11}-\frac{7}{25}\cdot\frac{14}{11}\)
\(=9\frac{7}{25}+\frac{3}{25}\cdot\frac{7}{11}-\frac{14}{25}\cdot\frac{7}{11}\)
\(=9\frac{7}{25}+\frac{7}{11}\cdot\left(\frac{3}{25}-\frac{14}{25}\right)\)
\(=9\frac{7}{25}+\frac{7}{11}\cdot\left(-\frac{11}{25}\right)\)
\(=9\frac{7}{25}+\left(-\frac{7}{25}\right)\)
\(=9\)
Chắc sai =]]
\(\frac{25}{72}+\frac{25}{90}+\frac{25}{110}+...+\frac{25}{9900}\)
= \(25.\left(\frac{1}{72}+\frac{1}{90}+\frac{1}{110}+...+\frac{1}{9900}\right)\)
= \(25.\left(\frac{1}{8.9}+\frac{1}{9.10}+\frac{1}{10.11}+...+\frac{1}{99.100}\right)\)
= \(25.\left(\frac{1}{8}-\frac{1}{9}+\frac{1}{9}-\frac{1}{10}+\frac{1}{10}-\frac{1}{11}+...+\frac{1}{99}-\frac{1}{100}\right)\)
= \(25.\left(\frac{1}{8}-\frac{1}{100}\right)\)
= \(25.\frac{23}{200}\)
= \(\frac{23}{8}\)
-25 x 72 + 25 x 21 - 49 x 25
= 25 x (-72 + 21 - 49)
= 25 x (-100)
= -2500
-25 x 72 + 25 x 21 - 49 x 25
= 25 x ( -72 ) + 25 x 21 - 49 x 25
= 25 x ( -72 + 21 - 49 )
= 25 x ( - 100 )
= -2500
-332.-25-25.232
=25(332-232)
=25.100
=2500
(-332) . (-25 ) - 25 . 232
=[ (-332).(-25) ] - 25.232
= 332 . 25 - 25 . 232
= 25 . (332 - 232 )
= 25 . 100
= 2500