1) 3 + 5/6 = 3 5/6
2) 9 + 4/7 = 9 4/7
3) 10 + 1/2 = 10 1/2
4) 7 + 5/10 = 7 5/10 = 7 1/2
5) 1 + 1/5 = 1 1/5
А = 3974 + 986
а= 4960
4960-986=3974
3974=3974
18 дм > 1 дм 9 см .................
X:9=1000-910
x:9=90
x=90•9
x=810
810:9=1000-910
x•9=1000-910
x•9=90
x=90:9
x=10
10•9=1000-910
100•x=2430-2030
100•x=400
x=400:100
x=4
100•4=2430-2030
100:x=2430-2420
100:x=10
x=100:10
x=10