Question

Calculeaza c : ( a + b ) =? Stiind ca: (a×3-108 : 6 ) × 2 = 114 [20-(10-30:b)×3]:8=1 2×[30+(c:100-2)×30 ]-4×50=100

Answer 1

(a×3-108 : 6 ) × 2 = 114
 (ax3-18)=114:2
ax3-18=57
ax3=57+18
ax3=75
a=75:3
a=25

[20-(10-30:b)×3]:8=1
20-(10-30:b)×3=1x8
20-(10-30:b)×3=8
(10-30:b)×3=20-8
(10-30:b)×3=12
10-30:b=12:3
10-30:b=4
30:b=10-4
30:b=6
b=30:6
b=5

2×[30+(c:100-2)×30 ]-4×50=100
2×[30+(c:100-2)×30 ]-200=100
2×[30+(c:100-2)×30 ]=100+200
2×[30+(c:100-2)×30 ]=300
30+(c:100-2)×30=300:2
30+(c:100-2)×30=150
30+(c:100-2)x30=150-30
(c:100-2)x30=120
c:100-2=120:30
c:100-2=4
c:100=4+2
c:100=6
c=100x6
c=600

c:(a+b)=600:(25+5)=600:30=20