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= 1,25 - 0,5 × 0,25
= 1,25 - 0,125
= 1,125
b. 1/4 + 1,5 : 0,25
= 1/4 + 1/5 : 1/4
= 1/4 + 1/5 × 4
= 1/4 + 4/5
= 5/20 + 16/20
= 21/20
= 1 1/20
c. 2 4/5 × 1/8 - 0,15
= 14/5 × 1/8 - 0,15
= 7/20 - 0,15
= 0,35 - 0,15
= 0,20
d. 35% + 2 4/5 × (0,25 + 1/5)
= 0,35 + 2,8 × (0,25 + 0,2)
= 0,35 + 2,8 × 0,45
= 0,35 + 1,26
= 1,61
e. 2,5 : 1/4 - 1 1/5 × 20%
= 2 1/2 : 1/4 - 1 1/5 × 20/100
= 5/2 × 4 - 6/5 × 1/5
= 10 - 6/25
= 9 19/25
f. 3 5/6 × 0,4 - 1 1/8 : 3/4
= 23/6 × 2/5 - 9/8 × 4/3
= 23/15 - 3/2
46 45
= --------- - ---------
30 30
1
= --------
30
may be useful.........