Question

(43×11-19×21):37=? ; (419+288:24+1):18=? ; [403:13-(6309:9+7×4):27]:2-1=?

Answer 1

( 43 × 11 - 19 × 21 ) : 37 = 2

= ( 473 - 399 ) : 37 =

= 74 : 37 =

= 2

_____________

( 419 + 288 : 24 + 1 ) : 18 = 24

= ( 419 + 12 + 1 ) : 18 =

= 432 : 18 =

= 24

___________

[ 403 : 13 - ( 6 309 : 9 + 7 × 4 ) : 27 ] : 2 - 1 = 1

= [ 31 - ( 701 + 28 ) : 27 ] : 2 - 1 =

= ( 31 - 729 : 27 ) : 2 - 1 =

= ( 31 - 27 ) : 2 - 1 =

= 4 : 2 - 1 =

= 2 - 1 =

= 1

Answer 2

a)

(473-399):37=74:37=2

b)

(419+12+1):18=432:18=14

c)

[31-(701+28):27]:2-1=

(31-729:27):2-1=

(31-27):2-1=

4:2-1=2-1=1