Question

(1 целая-7/10)x=2целых1/4

Answer 1

х= 7,5 .Сейчас решила и ответ точный

Answer 2

$begin{aling} left(1-dfrac{7}{10}right)times x = 2dfrac{1}{4}\ left(dfrac{10}{10}-dfrac{7}{10}right)times x = dfrac{9}{4}\ dfrac{3}{10}times x = dfrac{9}{4}\ x = dfrac{9}{4}timesdfrac{10}{3}\ x = dfrac{15}{2}\ x = 7dfrac{1}{2}\ end{aling}$