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23,12*300=6936
67,38*3000=20314
900*23,12=20808
8000*6,13=49040
![](https://rs.olm.vn/images/avt/0.png?1311)
23,12 x 300 = 6936
67,38 x 3000 = 202140
900 x 23,12 = 20808
8000 x 6,13 = 49040
![](https://rs.olm.vn/images/avt/0.png?1311)
1000.1000.1000:2000+5000+8000:20.10 = 1000 000 .1/2 + 5000 + 400.10
= 500 000 + 5000 + 4000 = 509 000
![](https://rs.olm.vn/images/avt/0.png?1311)
A. \(\left(x+1\right)+\left(x+2\right)+......+\left(x+100\right)=5750\)
\(x+1+x+2+....+x+100=5750\)
\(100x+\left(1+2+3+.......+100\right)=5750\)
\(100x+5050=5750\)
\(100x=700\)
\(x=700:100=7\)
B. x+(1+2+......+100) = 2000
x + 5050 = 2000
x = 2000 - 5050
x= -3050
C. ( x-1 )+(x-2)+......+( x - 100 ) = 50
x-1+x-2+.........+x-100 = 50
100x + ( -1-2-........-100 ) = 50
100x + ( - 5050 ) = 50
100x = 50 + 5050
100 x = 5100
x = 5100 : 100
x = 51
A . \(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+100\right)=5750\)
\(\left(x+x+x+...+x\right)+\left(1+2+3+...+100\right)=5750\)
\(100x+5050=5750\)
\(100x=5750-5050\)
\(100x=700\)
\(\Rightarrow x=\frac{700}{100}=7\)
B. \(x+\left(1+2+3+4+5+....+100\right)=2000\)
\(x+\frac{\left(100+1\right).100}{2}=2000\)
\(x+5050=2000\)
\(\Rightarrow x=2000-5050=-3050\)
C. \(\left(x-1\right)+\left(x-2\right)+\left(x-3\right)+....+\left(x-100\right)=50\)
\(\left(x+x+x+...+x\right)-\left(1+2+3+...+100\right)=50\)
\(100x-5050=50\)
\(100x=5100\)
\(\Rightarrow x=\frac{5100}{100}=51\)
![](https://rs.olm.vn/images/avt/0.png?1311)
34,67 + 13,73 + 43,65 + 56,35 + 77,23 + 86,27
= ( 43,65 + 56,35 ) + ( 86,27 + 13,73 ) + ( 34,67 + 77,23 )
= 100 + 100 + 111,9
= 200 + 111,9
= 311,9
k mình nha
![](https://rs.olm.vn/images/avt/0.png?1311)
a, Số dư là : 6,251 : 7 = 0,89 dư 0,021
b, Số dư là : 33,14 : 58 = 0,57 dư 0,08
c. Số dư là : 375,23 : 69 = 5,43 dư 0,56
Đáp số : a, 0,021.
b, 0,08.
c, 0,56.
tick nha.
\(8000+2000+x=11100\)
\(10000+x=11100\)
\(x=11100-10000\)
\(x=1100\)
x=3000