Răspuns:
a) 3/25
b) 15/126
c) 16/10
d)948/55
e)10/7
Explicație:
a)
3/5 * 2/10 = 3/5 * 1/5 = 3/25
b)
(1*3*5)/(2*7*9)= 15/126
c)
(4/5 -4/25)* 5/2=
(20-4)/25* 5/2=
16/25 * 5/2=
16*5 / 25*2=
16 / 5*2=
16/10
e)
2/7 : 1/5=
2/7 * 5/1=
2*5 / 7*1=
10/7
d)
(12*5+3)/5 + (4*11+7)/11=
63/5 + 51/11=
(63*11)/55 + (51*5)/55=
693/55 + 255/55=
948/55
