Question

Afla a din egalitatea : 75:[(a x3 +72:8)x9-19x6] +27x8= 217

Answer 1

75 : [(a x 3 + 72 : 8) x 9 - 19x 6 ] + 27 x 8 = 217
(75 : b ) + 216 = 217
75 : b = 217 - 216
75 : b = 1 
b = 75 : 1 
b = 75

( a x 3 + 72 : 8 ) x 9 - 19 x 6 = 75
c x 9 - 114 = 75
c x 9 = 75 + 114 
c x 9 = 189
c = 189 : 9 
c = 21

a x 3 + 72 : 8 = 21
a x 3 + 9 = 21 
a x 3 = 21- 9 
a x 3 = 12
a = 12 : 3 
a = 4