Question

Afla nummerele necunoscute:
A) (a-80)×2-146=24
B) (100-b:3)×5=490
C) (c:9:3)×4=20
Ajutati-ma va roogg
Dau coroana!!

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=2x3
b=6


(c:9:3)x4=20
c:9:3=20:4
c:9:3=5
c:9=5x3
c:9=15
c=15x9
c=135

Answer 2

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

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

c) (c : 9 : 3) × 4 = 20
c : 9 : 3 =>20 : 4 => 5
c : 9 = 5×3 =>15
c => 15 × 9
c=>135

Succeas la scoala, Coroana?