A = 44/11 + 32/10 + 63/7
= 4×11/1×11 + 3,2 + 9×7/1×7
=4/1 + 3,2 + 9/1
= 4+3,2+9
= 16,2
B = 1,3/1,2-11/12
= 13/12-11/12
= 2/12
= 1/6
C = 3/4+5/7+2/3+1/4+2/7+1/3
= 3/4+1/4+5/7+2/7+2/3+1/3
= 4/4+7/7+3/3
= 1+1+1
= 3
D = 7/10+1/4+39/13-75/25
= 7/10+1/4+3×13/1×13-3×5×5/1×5×5
= 7/10+1/4+3-3
= 14/20+5/20
= 19/20
= 9,5/10
=0,95
