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= 47 - ( 45 . 16 - 25 . 12 ) : 14
= 47 - ( 720 - 300 ) : 14
= 47 - 420 : 14
= 47 - 30
= 17
\(47-\left[\left(45.2^4-5^2.12\right):14\right]\) \(50-\left[\left(20-2^3\right):2+34\right]\)
\(=47-\left[\left(45.16-25.12\right):14\right]\) \(=50-\left[\left(20-8\right):2+34\right]\)
\(=47-\left[\left(720-300\right):14\right]\) \(=50-\left[12:2+34\right]\)
\(=47-\left(420:14\right)=47-30\) \(=50-\left[6+34\right]=50-40\)
\(=17\) \(=10\)
a) \(47-\left[\left(45\cdot2^4-5^2\cdot12\right):14\right]\)
\(=47-\left[\left(45\cdot16-25\cdot12\right):14\right]\)
\(=47-\left[\left(720-300\right):14\right]\)
\(=47-\left[420:14\right]=47-30=17\)
g ) 29 - \([16+3.\left(51-49\right)]\)
= 29 - \([\begin{matrix}16&+&3&.&2\end{matrix}]\)
= 29 - \([16\begin{matrix}+&6\end{matrix}]\)
= 29 -22
= 7
h ) 47 - ( 45 . 24 - 52 . 12 ) : 14
= 47 - ( 45 . 16 - 25 . 12 ) : 14
= 47 - ( 720 - 300 ) : 14
= 47 - 420 : 14
= 47 - 30
= 17
i ) 102 - 60 : ( 56 : 54 - 3 . 5 )
= 100 - 60 : ( 52 - 3 . 5 )
= 100 - 60 : ( 25 - 15 )
= 100 - 60 : 10
= 100 - 6
= 94
47-[(45.24-52.12)]:14
= 47 - [(45.16-25.12)]:14
= 47 - (720-300) : 14
= 47 - 420 : 14
= 47 - 30
= 17
47-[(45.24-52.12)]:14
=47-[(45.16-25.12)]:14
=47-[(720-300)]:14
=47-420:14
=47-30
=17
\(a)\)\(47-\left[\left(45.2^4-5^2.12\right)\div14\right]\)
\(=\)\(47-\left[\left(45.16-25.12\right)\div14\right]\)
\(=\)\(47-\left[\left(720-300\right)\div14\right]\)
\(=\)\(47-\left[420\div14\right]\)
\(=\)\(47-30\)
\(=\)\(17\)
\(b)\)\(10-\left[\left(8^2-48\right).5+\left(2^3.10+8\right)\right]\div28\)
\(=\)\(10-\left[\left(64-48\right).5+\left(8.10+8\right)\right]\div28\)
\(=\)\(10-\left[16.5+\left(80+8\right)\right]\div28\)
\(=\)\(10-\left[16.5+88\right]\div28\)
\(=\)\(10-\left[80+88\right]\div28\)
\(=\)\(10-168\div28\)
\(=\)\(10-6\)
\(=\)\(4\)
c) \(2345-1000:\left[19-2\left(21-18\right)^2\right]\)
= \(2345-1000:\left[19-2.3^2\right]\)
= \(2345-1000:\left[19-2.9\right]\)
= \(2345-1000:\left[19-18\right]\)
= \(2345-1000:1\)
= \(1345\)
a)
204 - 84 : 12
= 204 - ( 84 : 12 )
= 204 - 7
= 107
b)
15 . 23 + 4 . 32 - 5 . 7
= 15 . 8 + 4 . 9 - 5 . 7
= 120 + 36 - 35
= 156 - 35
= 121
c)
56 : 53 + 23 . 22
= 5(6-3) + 2(3+2)
= 53 + 25
= 125 + 32
= 157
d) 164 . 53 + 47 . 164
= 164 . ( 53 + 47 )
= 164 . 100
= 16400
Thực hiện phép tính:
47-[(45.24-52.12):14]
=47-[(45.16-25.12):14]
=47-[(720-300):14]
=47-(420:14)
=47-30
=17