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![](https://rs.olm.vn/images/avt/0.png?1311)
\(A=1+6+11+...+46+51\)
\(=\left(51+1\right)\times\left[\frac{51-1}{5}+1\right]:2\)
\(=52\times11:2=286\)
A= 1 +6 + 11 + 16 +...+ 46+ 51
A= ( 1 + 51 ) x11 : 2
A= 52x 11 : 2
A= 572 : 2
A= 286
![](https://rs.olm.vn/images/avt/0.png?1311)
A = \(\frac{2^{10}.13+2^{10}.65}{2^8.104}\)
\(A=\frac{2^{10}.\left(13+65\right)}{2^8.104}=\frac{2^{10}.78}{2^8.104}\)
\(A=\frac{2^2.3}{1.4}=3\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a.120-[7.20-(134-110).5]
=120-(7.20-24.5)
=120-(140-120)
=120-20
=100
b.1987-200.8+1005:5
=1987-1600+201
=588
C, 387.2694+7305.387+387
=387.(2694+7305+1)
=387.10000
3870 000
d,
d.248:{[(368+232):120-3]+122}+2016
=248:{(600:120-3)+122}+2016
=248:(2+122)+2016
=248:144+2016
=2+2016
=2018
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.=24+42+120-24-42\)
\(=\left(24-24\right)+\left(42-42\right)+120\)
\(=0+0+120\)
\(=120\)
\(b.=13-145+49-13-49\)
\(=\left(13-13\right)+\left(49-49\right)-145\)
\(=0+0-145\)
\(=-145\)
![](https://rs.olm.vn/images/avt/0.png?1311)
- A=80-2=78
- B=17(85+15)-120=17x100-120=170-120=50
- C= 45(74+26)=45•100=4500
- D=5x10-62=50-36=14
![](https://rs.olm.vn/images/avt/0.png?1311)
\(B=\left(120+20\right):4-2^2.3\)
\(B=140:4-4.3\)
\(B=35-12\)
\(B=23\)
Tick mik nha
\(A=120+20:4-2^2.3\)
\(A=120+5-4.3\)
\(A=120+5-12\)
\(A=125-12\)
\(A=113\)
Đáp án là A