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56242
@56242
December 2019
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Determine a terceira proporcional dos números abaixo:
a) 1/2 e 2
b) 2/5 e 3/4
c) 4 e 1/5
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exalunosp
( 1/2) / 2 = 2/x
1/2 = 0,5 ***
0,5/2 = 2/x
0,5x = 2 * 2 (multiplicado em cruz)
0,5x = 4
x = 4/0,5 = 8 ****
b
2/5 e 3/4
( 2/5) / ( 3/4 ) = ( 3/4)/ x
em cruz
2/5 * x = 3/4 * 3/4
2x/5 = 9/16
em cruz
16 * 2x = 9 * 5
32x = 45
x = 45/32 ****
c
4/1 e 1/5
( 4/1)/ ( 1/5) = ( 1/5)/x
multiplica em cruz
( 4/1) * x = ( 1/5) . ( 1/5)
4x/1 = 1/25
em cruz
4x * 25 = 1 * 1
100x = 1
x = 1/100 ****
7 votes
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56242
muito obrigado
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1/2 = 0,5 ***
0,5/2 = 2/x
0,5x = 2 * 2 (multiplicado em cruz)
0,5x = 4
x = 4/0,5 = 8 ****
b
2/5 e 3/4
( 2/5) / ( 3/4 ) = ( 3/4)/ x
em cruz
2/5 * x = 3/4 * 3/4
2x/5 = 9/16
em cruz
16 * 2x = 9 * 5
32x = 45
x = 45/32 ****
c
4/1 e 1/5
( 4/1)/ ( 1/5) = ( 1/5)/x
multiplica em cruz
( 4/1) * x = ( 1/5) . ( 1/5)
4x/1 = 1/25
em cruz
4x * 25 = 1 * 1
100x = 1
x = 1/100 ****