Question

Решите задачу, пожалуйста. 5 класс

Answer 1

Ответ:

$P = 10\frac{32}{63}cm\\S=6\frac{2}{3}cm^{2}$

Пошаговое объяснение:

$b = 3\frac{1}{9}-\frac{61}{63}=3\frac{7}{63}-\frac{61}{63} =2\frac{70-61}{63}=2\frac{9}{63}=2\frac{1}{7} cm\\\\ P = 2(a + b) = 2(3\frac{1}{9}+2\frac{1}{7})=2(3\frac{7}{63}+2\frac{9}{63})=2*5\frac{7+9}{63} =2*5\frac{16}{63} =2*\frac{331}{63} =\frac{2*331}{63} =\frac{662}{63}=10\frac{32}{63} cm\\\\S = ab = 3\frac{1}{9} *2\frac{1}{7} =\frac{28}{9}*\frac{15}{7} =\frac{28*15}{9*7}=\frac{20}{3}=6\frac{2}{3}cm^{2}$