Question

[THI MIEU NGUYEN]

Thực hiện phép tính

a) 47 - [( 45 . 2⁴ - 5² . 12) : 14]                b) 10 - [(8² - 48) . 5 + (2³ . 10 + 8)] : 28

c) 2345 - 1000 : [19 - 2(21 - 18)²]            d) 177 : [2 .(4² - 9) + 3²(16 - 10)

Answer 1

[Lê Minh Vũ]

\(a)\)\(47-\left[\left(45.2^4-5^2.12\right)\div14\right]\)

\(=\)\(47-\left[\left(45.16-25.12\right)\div14\right]\)

\(=\)\(47-\left[\left(720-300\right)\div14\right]\)

\(=\)\(47-\left[420\div14\right]\)

\(=\)\(47-30\)

\(=\)\(17\)

\(b)\)\(10-\left[\left(8^2-48\right).5+\left(2^3.10+8\right)\right]\div28\)

\(=\)\(10-\left[\left(64-48\right).5+\left(8.10+8\right)\right]\div28\)

\(=\)\(10-\left[16.5+\left(80+8\right)\right]\div28\)

\(=\)\(10-\left[16.5+88\right]\div28\)

\(=\)\(10-\left[80+88\right]\div28\)

\(=\)\(10-168\div28\)

\(=\)\(10-6\)

\(=\)\(4\)

Answer 2

[✎﹏Kim Kim✧❤‿✶🌈(*•.¸♡ţęąɱ ƒŗęę ƒįŗę...]

c) \(2345-1000:\left[19-2\left(21-18\right)^2\right]\)

=     \(2345-1000:\left[19-2.3^2\right]\)

 =    \(2345-1000:\left[19-2.9\right]\)

=     \(2345-1000:\left[19-18\right]\)

=      \(2345-1000:1\)

=      \(1345\)