Răspuns
Explicație pas cu pas:
a) x = 2; y = 5 ⇒ x / y = 2 / 5 = 0,4; y / x = 5 / 2 = 2,5
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b) x = 3 / 8; y = 4 / 5
x / y = ( 3 / 8 ) : ( 4 / 5 ) = 3 / 8 ) × ( 5 / 4 ) = 15 / 32 = 0,46875
y / x = ( 4 / 5 ) : ( 3 / 8 ) = (4 / 5 ) × ( 8 / 3 ) = 32 / 15 = 2,1(3)
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c) x = 2,7; y = 1,2
x / y = 2,7 / 1,2 = 2,25
y / x = 1,2 / 2,7 = 0,(4)
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d) x = 0,(3) ; y = 1,2(3)
x = 0, (3) = 3 / 9 = 1 / 3
y = ( 123 - 12 ) / 90 = 111 / 90 = 37 / 30
x / y = ( 1 / 3 ) : ( 37 / 30 ) = ( 1 / 3 ) × ( 30 / 37 ) = 10 / 37 = 0,(270)
y / x = ( 37 / 30 ) : ( 1 / 3 ) = ( 37 / 30 ) × 3 = 37 / 10 = 3,7