1) 2736+2324=5060
Вот и все.
1,248:(2,7х-15,6)=0,1
1,248=(2,7х-15,6)*0,1
1,248=0,27х-1,56
1,248+1,56=0,27х
2,808=0,27х
х=2,808:0,27
х=10,4
№ 4
12/5 = 2 4/10 = 2,4
49/20 = 2 45/100 = 2,45
57/50 = 1 14/100 = 1,14
15/8 = 1 875/1000 = 1,875
81/40 = 2 25/1000 = 2,025