Sagot :
A= 1/3+1/6-1/18 = 6/18+3/18-1/18 = 8/18=4/9
B=7/3+8x1/12 = 28/12+8/12=36/12=3
C=(2/7-3/7)x(3+5/3) =(-1/7)*(9/3+5/3)= (-1/7)*(14/3)=-2/3
A=1/3+1/6-1/18
=6/18+3/18-1/18
=8/18
=4/9
B=7/3+8x1/12
=7/3+8/12
=7/3+2/3
=9/3
=3
C=(2/7-3/7)x(3+5/3)
=(-1/7)*(9/3+5/3)
=(-1/7)*(14/3)
=-14/21
=-2/3