a) 1/3+5/3=2
9/12-1/3=5/12
5/12+1/3=9/12
9/12-5/12=1/3
a. 1/3 + 5/3 = 6/3=2 ; 9/12 - 1/3 = 9/12 - 4/12 = 5 / 12 ; 5/12 + 1/3= 5/12 + 4/12 = 9/12 = 3/4 ; 9/12 - 5/12 = 4/12= 1/3
b. 2*3*4 / 2*4*3*5 = 24/120= 4/60 = 1/15 ; mh ko hieu 2 cau cuoi
Bn tu nghi not nhe
0o0 Chuc ban hoc gioi 0o0