Question

 Thực hiện phép tính:

a) 27 . 75 + 25 . 27 - 150;

b) 12 : {390 : [500 - (125 + 35 . 7)]}.

Answer 1

\(a.25.\left(75+25\right)-150.\)

\(=25.100-150\)

\(=2500-150=2350\)

\(b.12:\left\{390:\left[500-\left(125+245\right)\right]\right\}\)

\(=12\left\{390:\left[500-370\right]\right\}\)

\(=12:\left\{390:130\right\}\)

\(=12:3=4\)

Answer 2

a) 27 . 75 + 25 . 27 - 150

= 27 . ( 75 + 25 ) - 150

= 27 . 100 - 150

= 2700 - 150

= 2550

b) 12 : {390 : [500 - (125 + 35 . 7)]}.

= 12 : {390 : [500 - (125 + 245 ) ] }

= 12 : {390 : [500 - 370 ] }

= 12 : {390 : 130 }

= 12 : 3

= 4