Resposta :
Explicação passo-a-passo:
1/8 = x/32
8x = 32
x = 32 ÷ 8
x = 4
x/7 = 21/49
49x = 7 × 21
49x = 147
x = 147 ÷ 49
x = 3
5/8 = 30/x
5x = 8 × 30
5x = 240
x = 240 ÷ 5
x = 48
3/x = 9/15
9x = 3 × 15
9x = 45
x = 45 ÷ 9
x = 5
Explicação passo-a-passo:
1/8 = x/32
8x = 32
x = 32 ÷ 8
x = 4
x/7 = 21/49
49x = 7 × 21
49x = 147
x = 147 ÷ 49
x = 3
5/8 = 30/x
5x = 8 × 30
5x = 240
x = 240 ÷ 5
x = 48
3/x = 9/15
9x = 3 × 15
9x = 45
x = 45 ÷ 9
x = 5