Question

Найдите значение выражения: (8,25*10/11-10)*(11 2/3:2 2/9-6,15)+7:(-2 1/2)

Answer 1

$(8,25*\frac{10}{11}-10)(11\frac{2}{3}:2\frac{2}{9}-6,15)+7:(-2\frac{1}{2})$ = $(\frac{8,25*10}{11}-10)(\frac{35}{3}:\frac{20}{9}-6,15)+7:(-\frac{5}{2})$ = $(7,5-10)(\frac{35}{3}*\frac{9}{20}-6,15)+7*(-\frac{2}{5})$ = $-2,5(\frac{35*3}{20}-6,15)+(-\frac{7*2}{5})$ = $-2,5(\frac{7*3}{4}-6,15)+(-2,8)$ = $-2,5(5,25-6,15)-2,8$ = $-2,5*(-0,9)-2,8$ = $2,25-2,8$ = $-0,55.$