Răspuns
Explicație pas cu pas:
a) 91 / 70 = ( 91 : 7 ) / ( 70 : 7 ) = 13 / 10
b) 140 / 280 = ( 140 : 7 ) / ( 280 : 7 ) = 20 / 40
20 / 40 = 1 / 2 → se simplifica prin 20 ( 20 : 20) / ( 40 : 20 )
c) 7 / 28 = ( 7 : 7 ) / ( 28 : 7 ) = 1 / 4
d) 63 / 42 = ( 63 : 7 ) / ( 42 : 7 ) = 9 / 6
9 / 6 = ( 9 : 3 ) / ( 6 : 3 ) = 3 / 2 = 1 intreg si 1 / 2 = 1,5 ( rezolvare suplimentara )
e) 700 / 1400 = ( 700 : 7 ) / ( 1400 : 7 ) = 100 / 200
f) (7² x 5³) / ( 7x3⁴) = ( 7² : 7 x 5³) / ( 7 : 7 x 3⁴) = ( 7 x5³)/3⁴
=( 7 x 125) / 81 = 875 / 81
_________________________________________________
10989 / 22089 = ( 10989 : 3 ) / ( 22089 : 3 ) =
= (3663:37)/ (7363:37) = 99/199
