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= 2 + 0,6 + 7
= 9,6
b) 20% + ½%
= 0,20 + 0,05
= 0,25
c) -
d) 12 + ½ × 4
= 12 + 2
= 14
e) 20% : ½ - 3
= 20/100 × 2/1 - 3
= 40/100 - 3
= 0,4 - 3
= - 2,6
f) 0,2 + ⅓ - 3 × 0,5
= 0,2 + 0,33 - 1,5
= 0,53 - 1,5
= - 0,97