Sagot :
B=12x(8/8-1/4)
= 72
8
= 9
C= 13/15 - 4/15 x3/4
= 40
60
= 0.666.....
B= 12x(8/8-1/4) C= 13/15-4/15x3/4
= 12x(8/8-1x2/4x2) = 13/15 - 4x3/15x4
= 12x(8/8-2/8) = 13/15 - 12/60
= 12x(6/8) = 13x4/15x4 - 12/60
= 12x6/8 = 52/60 - 12/60
= 72/8 = 52-12/60
= 9 = 40/60 = 0,6666666667
