a) 2,31+0,5=2,81
b) 19,76+5,4=25,61
c) 1,4-0,6=0,8
d) 20,8-11.02=9,78
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a) 2,31+0,5=2,81
b) 19,76+5,4=25,61
c) 1,4-0,6=0,8
d) 20,8-11.02=9,78