Даю 50 балов 1) 18/35:9/49 2)7 11/18-5 11/12 3)30,2 – (18,376 + 4,8) = 4)–3,2·(–8) =

[latex]1)\;\frac{18}{35}:\frac9{49}=\frac{18}{35}\cdot\frac{49}9=\frac25\cdot\frac71=\frac{14}5=2\frac45\\2)\;7\frac{11}{18}-5\frac{11}{12}=7\frac{22}{36}-5\frac{33}{36}=6\frac{58}{36}-5\frac{33}{36}=1\frac{25}{36}\\3)\;30,2-(18,376+4,8)=30,2-23,176=7,024\\4)\;-3,2\cdot(-8)=3,2\cdot0,8=2,56[/latex]