hahahaha!
facem abstractie de cerinta.....
a. 7/16-11/42-9/16+17/42=-2/16+6/42=-1/16+3/21=(-21+48)/672=27/672=9/224
b. -3 5/11 + 1 3/8+2 5/6 - 4 6/11=-38/11+11/8+17/6-50/11=-88/11+11/8+17/6=
=-88·24/264+11·33/264+17·44/264=(-2112+363+748)/264=-1001/264
c. -1,23+2,11+7,38-5,77+1,62=(-1,23-5,77)+(7,38+1,62)+2,11= =-7+9+2,11=4,11
d. (1-1/2)-(1/3-1/2)-(1/4-1/3)= 1/2-1/3+1/2-1/4+1/3=1/2+1/2-1/4=2/2-1/4=
=4/4-1/4=3/4
