Oi.
Neste caso multiplique cruzado.
a) x/3 = 10/6
6.x = 3.10
6x = 30
x = 30/6
x = 5
b) x/4 = 91/52
52.x = 4.91
52x = 364
x = 364/52
x = 7
c) x/7 = 18/21
21.x = 7.18
21x = 126
x = 126/21
x = 6
d) x/105 = 2/30
30.x = 105.2
30x = 210
x = 210/30
e) x/8 = 36/32
32.x = 8.36
32x = 288
x = 288/32
x = 9
f) x/3 = 128/48
48.x = 3.128
48x = 384
x = 384/48
x = 8
Espero ter ajudado.
Boas festas
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Verified answer
Utilizei o asterisco no lugar do sinal de vezes.a) 6x = 3 * 10
x = 30/6
x = 5
b) 52x = 4 * 91
x = 364/52
x = 7
c) 21x = 7 * 18
x = 126/21
x = 6
d) 30x = 2 * 105
x = 210/30
x = 7
e) 32x = 8 * 36
x = 288/32
x = 9
f) 48x = 3 * 128
x = 384/48
x = 8. ; )
Verified answer
Oi.
Neste caso multiplique cruzado.
a) x/3 = 10/6
6.x = 3.10
6x = 30
x = 30/6
x = 5
b) x/4 = 91/52
52.x = 4.91
52x = 364
x = 364/52
x = 7
c) x/7 = 18/21
21.x = 7.18
21x = 126
x = 126/21
x = 6
d) x/105 = 2/30
30.x = 105.2
30x = 210
x = 210/30
x = 7
e) x/8 = 36/32
32.x = 8.36
32x = 288
x = 288/32
x = 9
f) x/3 = 128/48
48.x = 3.128
48x = 384
x = 384/48
x = 8
Espero ter ajudado.
Boas festas