Ex1
A=-13/8+7/16
=(-26+7)/16
=-19/16
B=7/35+8/15
=((7÷7)/(35÷7))+8/15
=1/5+8/15
=(3+8)/15
=11/15
Ex2
H=63/30×45/28
=((63÷3)/(30÷3))×45/28
=21/10×45/28
=945/280
=(945÷35)/(280÷35)
=27/8
J=24/35÷36/14
=24/35÷((36÷2)/(14÷2))
=24/35÷18/7
=24/35×7/18
=168/630
=(168÷42)/(630÷42)
=4/15
Ex3
M=-14/15+10/15×7/20
=-14/15+((10÷5)/(15÷5))×7/20
=-14/15+2/3×7/20
=-14/15+14/60
=-14/15+((14÷2)/(60÷2)
=-14/15+7/30
=(-28+7)/30
=-21/30
=-(21÷3)/(30÷3)
=-7/10
J=(1/8-7/12)÷(7/6+7/16)
=((12-56)/96)÷((112+42)/96)
=(-44/96)÷154/96
=-((44÷4)/(96÷4))÷/((154÷2)/(96÷2))
=-11/24÷77/48
=-11/24×48/77
=-528/1848
=-(528÷264)/(1848÷264)
=-2/7
