210.(22)10......(210)10=2n.Vậy n bằng bao nhiêu?
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![](https://rs.olm.vn/images/avt/0.png?1311)
a) x = 2.
b) x = 7.
c) x= 12.
d) x= 45.
e) x = 18.
f) x = 10.
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90 . 210 + 10 . 210
= ( 90 + 10 ) . 210
= 100 . 210
= 21000
k mk đi
![](https://rs.olm.vn/images/avt/0.png?1311)
Đặt \(A=2^0+2^1+...+2^{10}\)
\(\Leftrightarrow2A=2^2+2^3+...+2^{11}\\ \Leftrightarrow A=2^{11}-2^0=2^{11}-1\)
S = 1 + 2 + 22 + ... + 29 + 210
2S = 2 . (2 + 22 + ... + 29 + 210)
2S = 2 + 22 + 23 + ... + 210 + 211
2S - S = (2 + 22 + 23 + ... + 210 + 211 ) - (1 + 2 + 22 + ... + 29 + 210)
S = 211 - 1
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 27.75 + 25.27 – 150
= 2025 + 675 – 150 = 2550
b, 142 – [50 – ( 2 3 .10 – 2 3 .5)]
= 142 – [50 – (80 – 40)] = 132
c, 375:{32 – [4+( 5 . 3 2 – 42]} – 14
= 375:{32 – [4+(45 – 42)]} – 14
= 375:(32 – 7) – 14 = 15 – 14 = 1
d, {210:[16+3.(6+3. 2 2 )]} – 3
= [210:(16+3.18)] – 3
= 210 : 70 – 3 = 3 – 3 = 0
a, 27.75 + 25.27 – 150
= 2025 + 675 – 150 = 2550
b, 142 – [50 – ( 2 3 .10 – 2 3 .5)]
= 142 – [50 – (80 – 40)] = 132
c, 375:{32 – [4+( 5 . 3 2 – 42]} – 14
= 375:{32 – [4+(45 – 42)]} – 14
= 375:(32 – 7) – 14 = 15 – 14 = 1
d, {210:[16+3.(6+3. 2 2 )]} – 3
= [210:(16+3.18)] – 3
= 210 : 70 – 3 = 3 – 3 = 0