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a: =250:{5*(78-28)}
=250:{5*50}
=1
b: \(=3\cdot\left\{150:\left[152-77\right]\right\}\)
=3*{150:75}
=3*2=6
c: \(=12:\left\{390:\left[500-125-245\right]\right\}\)
=12:3=4
d: =100-[16*5+88]:28
=100-6=94
![](https://rs.olm.vn/images/avt/0.png?1311)
Trả lời :
a) 43 . 101 - 64
= 64 . 101 - 64
= 64 . ( 101 - 1 )
= 64 . 100 = 6400
b) \(\frac{5^8}{5^5}+3^2.3^3-\left(30-19\right)^2\)
= 53 + 35 - 112
= 125 + 243 - 121
= 247
a) 43 .101 - 64 =
= 43 . 101 - 43
= 43 .( 101 - 1 )
= 43 .100
= 6400
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 13.(23+22)-3.(17+28)
= 13.45 - 3.45
= 45(13-3)
= 45.10 =450
b) -48+48.(-78)+48(-21)
= -48 + 48(-78 - 21)
= -48 + 48.(-99)
= -48 + ( -4752)
= -4800
c) 135.(171-123)-171.(135-123)
= 135.171 - 135.123 - 171.135 + 171.123
= (135.171 - 171.135) - (135.123 - 171.123)
= - 123(135 - 171) = (-123).(-36)= 4428
![](https://rs.olm.vn/images/avt/0.png?1311)
a) \(28-\left(-32\right)+\left(-28\right)-32+5=28+32-28-32+5\)
\(=5\)
b) \(48-\left(-52\right)+64+\left(-34\right)\)\(=48+52+64-34\)
\(=130\)
k mình nha vì mình đang âm điểm
chúc pạn học giỏi
![](https://rs.olm.vn/images/avt/0.png?1311)
a)
\({5^7}{.5^5} = 5^{7+5}={5^{12}}\)
\({9^5} :{8^0} = {9^5}:1 = {9^5}\)
\(2^{10}:64.16 = 2^{10}:2^6.2^4 = 2^{10-6+4} = 2^8\)
b)
\(\begin{array}{l}54297 = 5.10000 + 4.1000 + 2.100 + 9.10 + 7\\ = {5.10^4} + {4.10^3} + {2.10^2} + 9.10 + 7\end{array}\)
\(\begin{array}{l}2023 = 2.1000 +0.100+2.10 + 3\\ = {2.10^3}+ 2.10 +3\end{array}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(10-\left[\left(8^2-48\right).5+\left(2^3.10+8\right)\right]:28\)
\(=10-\left[\left(64-48\right).5+\left(8.10+8\right)\right]:28\)
\(=10-\left[16.5+\left(80+8\right)\right]:28\)
\(=10-\left[16.5+88\right]:28\)
\(=10-\left[80+88\right]:28\)
\(=10-168:28\)
\(=10-6\)
\(=4\)
10-[(82-48).5+(23.10+8)]:28
= 10-[(64-48).5+(8.10+8)]:28
= 10-[16.5+88]:28
= 10-[80+88]:28
= 10-168:28
= 10-6
= 4
![](https://rs.olm.vn/images/avt/0.png?1311)
100-[16.5.640]:28
=100-51200:28
thiếu dấu chịu gòi tính theo trên k q dài quá