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)
ta có: \(\frac{2011-4022:\left(x-2009\right)}{2011\times2012\times2013}\)
\(M=\frac{2011-2\times2011:\left(x-2009\right)}{2011\times2012\times2013}\)
\(=\frac{2011\times\left(1-2:\left(x-2009\right)\right)}{2011\times2012\times2013}\)
\(=\frac{1-2:\left(x-2009\right)}{2012\times2013}\ge0\)
Để M có giá trị nhỏ nhất
\(\Rightarrow\frac{1-2:\left(x-2009\right)}{2012\times2013}=0\)
=> 1 - 2: (X-2009) = 0 : ( 2012 x 2013)
1-2:(X-2009) = 0
2: (X-2009) = 1
X-2009 = 2
X = 2 +2009
X=2011
KL: Giá trí nhỏ nhất của M là 0 tại X =2011
![](https://rs.olm.vn/images/avt/0.png?1311)
\(0,35x135-35\%x35=0,35x\left(100+35\right)-0,35x35=0,35x100+0,35x35-0,35x35=35\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a. 2000 + (32,4 : 3 – 2,8) x 0,25
= 2000 + ( 10,8 - 2,8 ) x 0,25
= 2000 + 8 x 0,25
= 2000 x 2
= 4000
b. 40,28 - 20,05 : 12,5 + 1,7
= 40,28 - 1,604 + 1,7
= 38,676 + 1,7
= 40,376
XZSZSDXZSDSZSDESXZDESXZDERFDXSDFRDSXDERFTFDSZDERFTFDCXSZ
![](https://rs.olm.vn/images/avt/0.png?1311)
0,35 × 135 - 35% × 35
= 0,35 × 135 - 0,35 × 35
= 0,35 × (135 - 35)
= 0,35 × 100
= 35
\(0,35\times135-35\%\times35\)
\(=0,35\times135-0,35\times35\)
\(=0,35\times\left(135-35\right)\)
\(=0,35\times100\)
\(=35\)
![](https://rs.olm.vn/images/avt/0.png?1311)
c) Ta có: M < 4 => 13,8 : ( 5,6 - x ) < 4
=> 5,6 - x < 13,8:4
5,6 - x < 3,45
x < 5,6 - 3,45
x < 2,15
Vậy x < 2,15
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài làm
C1: 20,18 x 37,9 + 201,8 x 4,5 + 201,8 x 1,75
= 764,822 + 908,1 + 353,15
= 2026,072
C2: 20,18 x 37,9 + 201,8 x 4,5 + 201,8 x 1,75
= 20,18 x 3,79 x 10 + 201,8 x 4,5 + 201,8 x 1,75
= 20,18 x 10 x 3,79 + 201,8 x 4,5 + 201,8 x 1,75
= 201,8 x 3,79 + 201,8 x 4,5 + 201,8 x 1,75
= 201,8 x ( 3,79 + 4,5 + 1,75 )
= 201,8 x 10,04
= 2026,072
C3: 20,18 x 37,9 + 201,8 x 4,5 + 201,8 x 1,75
= \(\frac{2018}{100}x\frac{379}{10}+\frac{2018}{10}x\frac{45}{10}+\frac{2018}{10}x\frac{175}{100}\)
= \(\frac{2018}{100}x\frac{379}{10}+\frac{2018}{10}x\left(\frac{45}{10}+\frac{175}{100}\right)\)
= \(\frac{2018}{100}x\frac{379}{10}+\frac{2018}{10}x\left(\frac{450}{100}+\frac{175}{100}\right)\)
= \(\frac{2018}{100}x\frac{379}{10}+\frac{2018}{10}x\frac{25}{4}\)
= \(\frac{382411}{500}+\frac{10090}{8}\)
= \(\frac{382411}{500}+\frac{630625}{500}\)
= \(\frac{1013036}{500}\)
= \(2026,072\)
# Chúc bạn học tốt #
![](https://rs.olm.vn/images/avt/0.png?1311)
\(20,18\cdot37,5+201\cdot8+4,5+201,8\cdot1,75\)
\(=756,75+1608+4,5+353,15\)
\(=2364,75+357,65\)
\(=2722,4\)
\(47.20,18+360.2,018+1,7.201,8\)
\(=47.20,18+36.\left(10.2,018\right)+\left(1,7.10\right).20,18\)
\(=47.20,18+36.20,18+17.20,18\)
\(=20,18.\left(47+36+17\right)\)
\(=20,18.100=2018\)
47 x 20,18 + 360 x 2,018 + 1,7 x 201,8
= 47 x 20,18 + 36 x 10 x 2,018 + 1,7 x 10 x 20,18
= 47 x 20,18 + 36 x 20,18 + 17 x 20,18
= 20,18 x ( 47 + 36 + 17 )
= 20,18 x 100
= 2018
Hok tốt !