Question

Afla numerele necunoscute (a-80) x2 -146 =24 (100-b:3)x5=490 (c:9:3)x4=30

Answer 1

(a-80) x2 -146 =24
(a-80) x2=24+146
(a-80) x2=170
a-80=170:2
a-80=85
a=85+80
a=165

(100-b:3)x5=490
100-b:3=490:5
100-b:3=98
b:3=100-98
b:3=2
b=2×3
b=6


(c:9:3)x4=30
c:9:3=30:4
c:9:3=7,5
c:9=7,5×3
c:9=22,5
c=22,5×9
c=202,5

Answer 2

(a-80) x2 -146 = 24
(a - 80 ) x2 =24+146
(a -80 ) x2 =170
a-80 =170:2
a-80 =85
a= 85+80
a=165

(100-b:3)x5=490
(100-b :3)=490:5
100-b:3=98
b:3=100-98
b:3=2
b=2x3
b=6

(c:9:3)x4=30
c:9:3=30:4
c:9:3=7,5
c:9=7,5x3
c:9=22,5
c=22,5x9
c=202,5