1.6÷3/8–3/8÷6
=1/6x(3/8-3/8)
=1/6x0
=0
2.4/7×5/9+3/7×5/9
=(4/7+3/7)x5/9
=1x5/9
=5/9
3.5/2-(3/2+4/5)
=5/2-3/2-4/5
=1-4/5
=1/5
4.6×(1/2+2/3)
=6x1/2+6x2/3
=3+4
=7
5.8×4/5+8×11/5
=8x(4/5+11/5)
=8x3
=24
6.31×5/6–5/6
=(31-1)x5/6
=30x5/6
=25
7.4/5×25/16+2/3×3/4
=5/4+1/2
=5/4+2/4
=7/4
8.101×1/5–1/5×21
=(101-21)x1/5
=80x1/5
=16