Question

Descubra o valor de ? para tornar a sentença verdadeira.

a) 3/5 + ? = 1
b) ? + 2/9 = 1
c) 1 - 3/7 = ?
d) 1 - ? = 2/3

Answer 1

a) 2/5
3/5+2/5=5/5=1

b) 7/9
7/9+2/9=9/9=1

c) 4/7
1/1-3/7 → 7/7-3/7 = 4/7

d) 1-x=2/3
-x=2/3-1
-x=2/3-3/3
-x=- 1/3
x=1/3
então 1-1/3=2/3