A.2 4/5×1/8-0,15= B.35%+2 4/5×(0,25+1/5)= C.2,5:1/4-1 1/5×20%= D.3 5/6×0,4-1 1/8:3/4=

a) 2 4/5 × 1/8 - 0,15
= 14/5 × 1/8 - 15/100
= 7/20 - 15/100
= 35/100 - 15/100
= 20/100
= 1/5

b) 35% + 2 4/5 × ( 0,25 + 1/5 )
= 35/100 + 14/5 × ( 25/100 + 1/5 )
= 35/100 + 14/5 × ( 25/100 + 20/100)
= 35/100 + 14/5 × 45/100
= 35/100 + 126/100
= 161/100
= 1 61/100

c) 2,5 ÷ ¼ - 1 1/5 × 20%
= 25/100 × 4/1 - 6/5 × 20/100
= 100/100 - 24/100
= 76/100
= 19/25

d) 3 5/6 × 0,4 - 1⅛ ÷ ¾
= 23/6 × 4/10 - 9/8 × 4/3
= 23/15 - 3/2
= 46/30 - 45/30
= 1/30