Răspuns:
Explicație pas cu pas:
Calculați,efectuând mai întâi simplificările:a)2 1/10-45/50-7/10=.......; b)1 11/24-19/24-30/72; c)1 1/26-11/26-9/78; d)1 7/30-19/30-16/60.
a) 2 1/10-45/50-7/10=2 1/10-(5·9)/(5·10)-7/10=2 1/10-9/10-7/10=
(2·10+1)/10-9/10-7/10=21/10-9/10-7/10=(21-16)/10=5/10=5/(5·2)=1/2
b) 1 11/24-19/24-30/72=1 11/24-19/24-(3·10)/(3·24)=
(1·24+11)/24-19/24-10/24=(35-29)/24=6/24=6/(6·4)=1/4
c) 1 1/26-11/26-9/78=1 1/26-11/26-(3·3)/(3·26)=1 1/26-11/26-3/26=(1·26+1)/26--11/26-3/26=(27-11-3)/26=(27-14)/26=13/26=13/(13·2)=1/2
d) 1 7/30-19/30-16/60=1 7/30-19/30-(2·8)/(2·30)=1 7/30-19/30-8/30=
(1·30+7)/30-19/30-8/30=(37-19-8)/30=(37-27)/30=10/30=10/(3·10)=1/3
