Question

Află numerele necunoscute

Answer 1

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

(100-b:3)×5=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)×4=20
c:9:3=20:4
c:9:3=5
c:9=5×3
c:9=15
c=15×9
c=135

Answer 2

Răspuns

348 ; 6 ; 135 ;

Explicație pas cu pas:

a) (a-80)*2-146 = 24 ; 2a-160 = 146+24 = 170 ; 2a = 170+160 = 330

a = 330:2 = 165 ;

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

c) (c:9:3)*4 = 20 ; c:27 = 20:4 = 5 ; c = 5x27 = 135 ;