1) 4,3=4 3/10+3 1/2=43/10+7/2=43/10+35/10=78/10
7/10:3/1=78/10*1/3=78/30=2,6
2)3 9/20+2,75=69/20+2 75/100= 69/20+275/100=345/100+275/100=620/100:2/1=620/100*1/2=620/200=3,1
3)33,74=33 74/100-5 1/25=3374/100-101/25=3374/100-404/100=2970/100:7/1=2970/700=4,24
4)37 1/5-6,8=186/5-34/5=152/5:8=152/40=3,8
5)14,7+ 23 4/5=14 7/10+23 4/5=147/10+119/5=147/10+238/10=385/10==38,5:11=3,5
6)61,68-4 2/25=61 68/100-4 2/25=6168/100-102/25=6168-408/100=5760/100=57,6:12=4,8