Question

Thực hiện phép tính:

a)2³.15 - [115-(12-5)² ]

b) 100 : {250 : [450 - (4.5³ - 2³.25)]}

Answer 1

Mik làm 1 câu thôi sức ko

Answer 2

\(2^3.15-\left[115-\left(12-5\right)^2\right]=8.15-\left[115-7^2\right]=120-\left[115-49\right]=120-66=54\)

\(100:\left\{250:\left[450-\left(4.5^3-2^2.25\right)\right]\right\}=100:\left\{250:\left[450-\left(4.125-4.25\right)\right]\right\}=100:\left\{250:\left[450-\left(500-100\right)\right]\right\}\)

\(=100:\left[250:\left(450-400\right)\right]=100:\left(250:50\right)=100:5=20\)

Answer 3

a,2³ . 15 -[115-\((\)12-5)²]

= 8. 15 - [115- 7² ]

=120-[115-49]

=120-66

=54

b, 100:{250:[450-\((\)4.5³ - 2³.25)]}

=100:{250:[450-\((\)4.125-8.25)]}

=100:{250:[450-\((\)500-300)]}

=100:{250:[450-200]}

=100:{250:250}

=100:1

=100