Răspuns:
a)
(23•4-77)/4 + (78-15•5)/5 - (7•8-19)/24 =
15/4 + 3/5 - 37/24 =
4=2^2
5=5
24=2^3 • 3
cmmmc = 2^3 • 3 • 5 = 120
(15•30+3•24-37•5)/120 =
(450+72-185)/120 =
(522-185)/120 =
337/120 = 2 întregi 97/120
b)
1109/90 + 41/3 + 35/6 - 137/9 - 361/72 + 221/72 =
90=2 • 3^2 • 5
3=3
6=2 • 3
72 = 2^3 • 3^2
cmmmc = 2^3 • 3^2 • 5 = 360
(1109•4+41•120+35•60-137•40-361•5+221•5)/360 =
(4436+4920+2100-5480-1805+1105)/360 =
5276/360 =
14,6(5)
