Question

Calculeaza : [(16*5+4*5):100+3]:4+1:[2+11*5-(2*25+62):2] gasestenumaruul necunoscut din relatiile : (a+3):7+11=13,,,,,,, (x+7)*9-90=582,,,,,,,,,,,,,,5*(8+x)*6=420,,,,,,,,,,,,,,, 21:[4-(13-x)*2+1]=25-(6*3+4) DAU COROANA VA ROG RAPIDDDDDDDDDDDDDD

Answer 1

 [(16*5+4*5):100+3]:4+1:[2+11*5-(2*25+62):2] =
=[(80+20):100+3]:4+1:[2+55-(50+62):2] =
=(100:100+3):4+1:(2+55-112:2) =
=(1+3):4+1:(57-56) =
=4:4+1:1 =
=1+1=2

(a+3):7+11=13
(a+3):7=13-11
(a+3):7=2
a+3=2×7
a+3=14
a=14-3
a=11

(x+7)*9-90=582
(x+7)*9=582+90
(x+7)*9=672
x+7=672/9
x=672/9-7
x=(672-63)/9=609/9=203/3=67,(6)

5*(8+x)*6=420
8+x=420:30
8+x=14
x=14-8=6


21:[4-(13-x)*2+1]=25-(6*3+4) 
21:[4-(13-x)*2+1]=25-(18+4) 
21:[4-(13-x)*2+1]=25-22
21:[4-(13-x)*2+1]=3
4-(13-x)*2+1=7
-(13-x)*2=7-4-1
-(13-x)*2=2
13-x=-1
x=14