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= 23%
b.) 1 5/8 + 3/7 + 11/2
= 13/8 + 3/7 + 11/2
= ( 91 + 24 + 308 ) / 56
= 423 / 56
= 7,55
c.)4 1/3 - 2 2/10 + 11/15
= 13/3 - 22 /10 + 11/15
= ( 130 - 66 + 22 ) / 30
= 86/30
= 2,86
d.) 1 5/6 × 2 1/3 × 3 1/4
= 11/6 × 7/3 × 13/4
= 1001/72
= 13,9
e.) 37,59 × 4,5
= 169,155
f.) 2/4 = 0,5