Răspuns:
4.
a)3/7-1/10 numitor comun:70
30-7/10=23/10( efracție ireductibila)
b)13/4-2 numitor comun:4
13-8/4=5/4(fractie ireductibila)
c)12/3+2/5=1•3+2/3+2/5=5/3+2/5numitor comun15
25+6/15=31/15(ired.)
e)6-3/5+4/9=(270-27+20)÷45=263/45
f)11/2+(12-5)÷6=11/2+7/6=(33+7)/6=40/6=20/3
g)4/5-1/9=(36-5)/45=31/45
sper ca te-am ajutt
