47 -[( 45 x24 - 52 x 12 ) ] : 14 giup minh nha minh can gap
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)
\(45-/x+14/=2^3.3\)
\(=>45-/x+14/=24\)
\(TH1:x\ge14=>/x+14/=\left(x+14\right)\)
\(=>45-/x+14/=24\)
\(=>45-\left(x+14\right)=24\)
\(=>x+14=45-24\)
\(=>x=21-14\)
\(=>x=7\)
\(TH2:x< 14=>/x+14/=-\left(x+14\right)=-x-14\)
\(=>45-/x+14/=24\)
\(=>45+x-14=24\)
\(=>45-x=24+14\)
\(=>x=45-38\)
\(=>x=7\)
Vậy...
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
( X - 90 ) : 30 = 4
X - 90 = 4 x 30
X - 90 = 120
X = 120 + 90
X = 210
~ Chúc bạn hok tốt ~
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+...+\frac{1}{90}+\frac{1}{110}\)
\(=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+...+\frac{1}{9.10}+\frac{1}{10.11}\)
\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+...+\frac{1}{9}-\frac{1}{10}+\frac{1}{10}-\frac{1}{11}\)
\(=1-\frac{1}{11}\)
\(=\frac{10}{11}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
( 1 + 3 + 5 + 7 + ... + 2003 + 2005 ) x ( 1212 x 27 - 2727 x 12 )
= ( 1 + 3 + 5 + 7 + ... + 2003 + 2005 ) x ( 32724 -32724 )
= ( 1 + 3 + 5 + 7 + ... + 2003 + 2005 ) x 0
= 0
![](https://rs.olm.vn/images/avt/0.png?1311)
\(=47-\left[\dfrac{\left(45\cdot16-25\cdot12\right)}{14}\right]\)
=47-420/14
=47-30
=17
47 -[( 45 x 24- 52 x 12)] : 14
= 47- [( 45 x 16 - 25 x 12)] : 14
= 47- [( 720 - 300 )] : 14
= 47- 420 : 14
= 47- 30
= 17