Question

Efectúa la siguiente operación: 72:8+4·(15-4·3)-12=?
(6+4:2)·5+(2·6:4+1)-18=?
6·(3+23)-[12-(8:4+2)]=?

Answer 1

72:8+4(15-4.3)-12 = 9+4(15-12)-12=9+4(3)-12=9+12-12=9 
(6+4:2).5+(2.6:4+1)-18=(6+2).5+(12:4+1)-18=8.5+(3+1)-18=40+4-18=26
6.(3+23)-(12-(8:4+2)) =6.(3+23)-(12-(2+2))=6.(3+23)-(12-4)=6.(3+23)-8= 6.(26)-8=156-8=138

Answer 2

a) (6+4:2) x 5 + (2 x 6 : 4) - 18 =
 = (6 -2) x 5 + 8 - 18 =
 = 30 - 10 + 8 - 18 = 10

b) 6 x (3 + 23) - l 12 - (8÷4 + 2 ) =
= 18 + 138 - l 12 - 2 + 2) =
= 156 - 12 = 144