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

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