Question

помогите пожалуйста!!!

Answer 1

1)2ц5/14-1ц4/21=33/14-25/21=99/42-50/42=49/42=1ц1/6 2)4,2÷1ц1/6=4ц1/5÷1ц1/6=21/5÷7/6=21/5×6/7=18/5=3ц3/5 3)8-3ц3/5=4ц2/5

Answer 2

$\displaystyle \tt 8-4,2:\bigg(2\frac{5}{14}-1\frac{4}{21}\bigg)=4,4\\\\\\\\1). \ 2\frac{5}{14}-1\frac{4}{21}=2\frac{15}{42}-1\frac{8}{42}=1\frac{7}{42}=1\frac{1}{6}\\\\2). \ 4,2:1\frac{1}{6}=\frac{42}{10}\cdot\frac{6}{7}=\frac{36}{10}=3,6\\\\3). \ 8-3,6=4,4$