Đáp án+Giải thích các bước giải:
a)
5/12+\frac{-7}{24}+3/8
=\frac{10}{24}-7/24+9/24
=\frac{10-7+9}{24}
=12/24
=1/2
b)
\frac{-5}{17}. 31/33+\frac{-5}{7}. 2/33+2 5/17
=(-5/17).(31/33+2/33)+(2+ 5/17)
=(-5/17). 33/33+2+5/17
=5/17.(-1+1)+2
=5/17. 0+2
=0+2
=2
c)
15.(2/3)^{2}+(23/6)^{0}. 24/16-2 2/3
=15. 4/9+1. 3/2- (2+2/3)
=60/9+3/2-2-2/3
=20/3-2/3+3/2-2
=18/3-2+3/2
=6-2+3/2
=4+3/2
=8/2+3/2
=11/2