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a) 125% - 0,85
= 125/100 - 85/100
= 40/100 = 4/10
= 2/5
b) 550% x 3,5 : 2 3/4
= 550/100 x 35/10 : 11/4
= 19.250/1000 x 4/11
= 77.000/11.000
= 7
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