Question

памагите пожалуйста ​

Answer 1

$1)\ \ 8\dfrac7{10}-\bigg(7\dfrac45-a\bigg)=8\dfrac7{10}-7\dfrac8{10}+a=a+(7-7)+\dfrac{7+10-8}{10}=a+\dfrac{9}{10}$

При  a = 6 1/2

$6\dfrac12+\dfrac9{10}=6\dfrac{5+9}{10}=6\dfrac{14}{10}=7\dfrac4{10}=7.4$

$2)\ \ a-\bigg(9\dfrac3{50}-5\dfrac7{25}\bigg)=a-(8-5)+\dfrac{3+50-14}{50}=a-3\dfrac{39}{50}$

При  a = 7 1/2

$7\dfrac12-3\dfrac{39}{50}=(6-3)+\dfrac{25+50-39}{50}=3\dfrac{36}{50}=3.72$