Question

Determinati valorile lui a din :
b) [676 :13 : (31*20 - 31 - a )] *45 -23 *91= 247
c) {[( 205: 5 +362 :2 ) - 32 *6 +a ] *221 :13} - 140 :5= 635
d) [( 30+ 226 :2+ a :4) :29+ 20 *100 ] :5 -11*6 -5*67=0
Va rog mult sa ma ajutati !!

Answer 1

b) [676:3:(31*20-31-a)]*45-23*91=247
[676:3:(620-31-a)]*45-2093=247
[676:3:(589-a)]*45=247+2093
[52:(589-a)]*45=2340
52:(589-a)=2340:45
52:(589-a)=52
589-a=1
a=589-1
a=588
c){[( 205: 5 +362 :2 ) - 32 *6 +a ] *221 :13} - 140 :5= 635 
{[(41+181)-192+a]*17}-28=635
(222-192+a)*17=635+28
(222-192+a)*17=663
3+a=39
a=39-3
a=36