Question

Вычислить; 1)75-3,75; 2)0,48*25; 3)2/3-2; 4)4/7:8 5)5 1/2*2/11 6)1 1/7:1/14 7)-18:(-4,5);

Answer 1

$tt displaystyle 1); 75-3,! 75=75,! 00-3,! 75=boxed{71,! 25} \ \ 2); 0,! 48cdot 25=frac{48}{100} cdot 25=frac{48}4 =boxed{12} \ \ 3); frac23 -2=frac23 -frac63 =-frac43 =boxed{-1frac13 } \ \ 4); frac47 :8=frac4{7cdot 8} =frac1{7cdot 2} =boxed{frac1{14} } \ \ 5); 5frac12 cdot frac2{11} =frac{5cdot 2+1}2 cdot frac2{11} =frac{11cdot 2}{2cdot 11} =boxed{1} \ \ 6); 1frac17 :frac1{14} =frac87 cdot frac{14}1 =8cdot 2=boxed{16} \ \ 7); -18:(-4,! 5)=18:frac{45}{10} =18cdot frac29 =2cdot 2=boxed{4}$