Răspuns:
Explicație pas cu pas:
a)
0,3/a = b/15
a × b = 0,3 × 15 = 4,5
b)
1,2/a = b/2,5
a × b = 1,2 × 2,5 = 3
c)
8/a = b/(0,25 + 3/2)
a × b = 8 × (0,25 + 3/2)
a × b = 8 × (25/100 + 3/2)
a × b = 8 × (1/4 + 3/2)
a × b = 8 × (1/4 + 6/4) = 8 × 7/4 = 2 × 7 = 14
d)
(1/2 + 1/2 : 3)/a = b/12
a × b = 12 × (1/2 + 1/2 : 3)
a × b = 12 × (1/2 + 1/2 × 1/3)
a × b = 12 × (1/2 + 1/6)
a × b= 12 × (3/6 + 1/6) = 12 × 4/6 = 2 × 4 = 8
