100 + 20 + 20 + 20 + 20 + 20
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![](https://rs.olm.vn/images/avt/0.png?1311)
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\(100.20.30-100+20+30+40+20\)
\(=100.600-100+110\)
\(=100.600+10\)
\(=10.10.600+10.1\)
\(=10.\left(6000+1\right)\)
\(=10.6001=60010\)
![](https://rs.olm.vn/images/avt/0.png?1311)
100 - ( 20 + 20 + 20 + 20 + 10 ) : 2
100 - ( 20 x 4 + 10 ) : 2
= 100 - ( 80 + 10 ) : 2
= 100 - 90 : 2
= 100 - 45
= 55
20 x 1 + 20 x 2 + 20 x 3 + 20 x 4 + 20 x 5 + 20 x 6 = ?
1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x ... x 100 = ?
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20x1+20x2+20x3+20x4+20x5+20x6= 20x(1+2+3+4+5+6)= 20 x 21 = 420
Còn câu 2 mik thấy khó quá cho mik xin lỗi nha
![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=1+2+2^2+2^3+...+2^{100}\)(có 101 số)
\(A=1+\left(2+2^2+2^3+2^4+2^5\right)+\left(2^6+2^7+2^8+2^9+2^{10}\right)+...+\left(2^{96}+2^{97}+2^{98}+2^{99}+2^{100}\right)\)
\(A=1+2\left(1+2+2^2+2^3+2^4\right)+2^6\left(1+2+2^2+2^3+2^4\right)+...+2^{96}\left(1+2+2^2+2^3+2^4\right)\)
\(A=1+2\cdot31+2^6\cdot31+...+2^{96}\cdot31\)
\(A=1+31\left(2+2^6+...+2^{96}\right)\)
\(\Rightarrow A:31\) dư 1
![](https://rs.olm.vn/images/avt/0.png?1311)
ket qua bang 200
100 + 20 + 20 + 20 + 20 + 20
= 100 + (20 x 5)
= 100 + 100
= 200