Sagot :
A=7/3x5/4+11/12
=(7*5) / (3*4) +11/12
=35/12+11/12
=46/12
=23/6
B =3/2x4/7-9/7x1/2
=(3*4) / (2*7) - (9*1) / (7*2)
=12/14-9/14
=3/14
C = 1/3+7/4x5/3
=1/3+(7*5) / (4*3)
=(1*4) / (3*4) +(7*5) / (4*3)
=4/12+35/12
=39/12
D = (3/5-3/25)x5/4
=(3*5) / (5*4) - (3*5) / (25*4)
=15/20-15/100
=(15*5) / (20*5) -15/100
=75/100-15/100
=60/100
=3/5
A = 7/3 * 5/4 + 11/12 B = 3/2 * 4/7 - 9/7 *1/2 C = 1/3 + 7/4 * 5/3
= 35/ 12 + 11/12 = 12/14 - 9/14 = 1/3 + 35/12
= 46/12 = 3/14 = (1*4)/(3*4) + 35/12
= 4/12 + 35/12 = 39/12 = 3,25
D = (3/5 - 3/25) * 5/4
= ((3*5/5*5) - 3/25) * 5/4
= (15/25 - 3/25) * 5/4
= 12/25 * 5/4
= 60/100
= 6/10 = 0,6