Question

tính

a) 47 x [(45 x 2⁴ - 5² . 12 ) ]:14

b)50 - [(20 - 2³):2 +34]

 

Answer 1

a, 47 . [(45 . 2⁴ - 5² . 12) ] : 14
 = 47 . [(45 . 16 - 25 . 12) ] : 14
 = 47 . [(720 - 300) ] : 14
 = 47 . 420 : 14
 = 19740 : 14
 = 1410
b, 50 - [(20 - 2³ ) : 2 + 34]
 = 50 - [(20 - 8) : 2 + 34]
 = 50 - [12 : 2 + 34]
 = 50 - [6 + 34]
 = 50 - 40
 = 10
Chúc bạn học tốt

Answer 2

a) \(47\times\left[\left(45\times2^4-5^2\times12\right)\right]:14\)

\(=47\times\left[\left(45\times16-25\times12\right)\right]:14\)

\(=47\times\left[\left(720-300\right)\right]:14\)

\(=47\times420:14\)

\(=19740:14\)

\(=1410\)

b) \(50-\left[\left(20-2^3\right):2+34\right]\)

\(=50-\left[\left(20-8\right):2+34\right]\)

\(=50-\left[12:2+34\right]\)

\(=50-\left[6+34\right]\)

\(=50-40\)

\(=10\)

_Chúc bạn học tốt_