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b) 6 3/7*0,7:22,5=45/7*7/10:225/10=9/2*10/225=1/5
c) 17,6+5,59=23,19
d) 100,21-17,8=82,41
e) 0,17*5,2=17/100*52/10=221/250=0,884
f) 0,672:2,8=672/1000:28/10=672/1000*10/28=0,24
g) 3 3/5:0,15=18/5:15/100=18/5*100/15=24
h) 6,18-1 1/4=6,18-1,25=4,93
i) 5 4/7+3,4=39/7+34/10=390/70+238/70=628/70=8 68/70