![](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)
a) 2001 x 757 + 2002 x 233
= 2001 x 757 + (2001 + 1) x 233
= 2001 x 757 + 2001 x 233 + 1 x 233
= 2001 x (757+233) + 233
= 2001 x 1000 + 233
= 2001000 + 233
= 2001233
a) 2001x757+2002x243
=2001 x 757+ (2001+1) x233
=2001 x757+2001x233+1 x233
=2001x(757+233)+233
=2001x1000 +233
=201000+233
=2001233
b)(m:1-m x1):(mx2001+m+1)
=(m-m):(mx2001+m+1)
=0:(mx2001+m+1)
=0
Học tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
A = 2003 × 2002 - 2/2001 × 2003 + 2001
A = 2003 × (2001 + 1) - 2/2001 × 2003 + 2001
A = 2003 × 2001 + (2003 - 2)/2001 × 2003 + 2001
A = 2003 × 2001 + 2001/2001 × 2003 + 2001
A = 1
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{2000\cdot2001-1001}{1999\cdot2002-999}=\frac{1999\cdot2001+2001-1001}{1999\cdot2001+1999-999}\)
\(=\frac{1999\cdot2001+1000}{1999\cdot2001+1000}=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có :
\(A=\frac{3}{4.5}+\frac{3}{5.6}+\frac{3}{6.7}+...+\frac{3}{99.100}\)
\(A=3\left(\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}+...+\frac{1}{99.100}\right)\)
\(A=3\left(\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+...+\frac{1}{99}-\frac{1}{100}\right)\)
\(A=3\left(\frac{1}{4}-\frac{1}{100}\right)\)
\(A=3.\frac{6}{25}\)
\(A=\frac{18}{25}\)
Vậy \(A=\frac{18}{25}\)
Chúc bạn học tốt ~
\(A=\frac{3}{4.5}+\frac{3}{5.6}+\frac{3}{6.7}+...+\frac{3}{99.100}\)
\(\Rightarrow A=3.\left(\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}+...+\frac{1}{99.100}\right)\)
\(\Rightarrow A=3.\left(\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+...+\frac{1}{99}-\frac{1}{100}\right)\)
\(\Rightarrow A=3.\left(\frac{1}{4}-\frac{1}{100}\right)=\frac{3.24}{100}\)
\(=\frac{3.4.6}{25.4}\)
\(\Rightarrow A=\frac{18}{25}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
=\(\frac{2001x2004x1001x2006}{2004x2006x2001x2002}\)=\(\frac{1}{2}\)
\(=\frac{2001.2004.1001.2002}{2004.2006.2001.2002}=\frac{1.1.1001.1}{1.2006.1.1}=\frac{1001}{2006}\)
=2001*(767+233)*2002
=2001*1000*2002
=4006002000
nha! sao bạn ko thay số 2001=2002 hoặc thay 2002=2001 để cho dễ tính hơn?
chúc bạn học giỏi
2001*( 767 + 233) + 2002
=2001 * 1000 + 2002
= 2001 * 3002
= 6007002
chúc bạn học tốt