Пусть х-одна часть, тогда а=4х, b=5х. Р=(a+b)*2 подставим: 54=(4х+5х)*2 поделим обе части на два: 27=9х х=3, значит а=3*4=12 и b=5*3=15 ответ: а=12, b=15
My brother Alex is a footballer and he is very fit. He usually (1)sleeps eight hours and doesn’t go to bed late . He does morning(2) exercises regularly and runs 10 km every day. Alex (3) doesn't like watching TV or playing computer games. He thinks it’s (4) better to ride a bike or walk in the park . Last year my brother (5) kept to a very strict diet of vegetables, water and fish before an important match. I hope Alex (6) make a very successful career in football because he is a real sportsman. sleep
My brother Alex is a footballer and he is very fit. He usually (1)sleeps eight hours and doesn’t go to bed late . He does morning(2) exercises regularly and runs 10 km every day. Alex (3) doesn't like watching TV or playing computer games. He thinks it’s (4) better to ride a bike or walk in the park . Last year my brother (5) kept to a very strict diet of vegetables, water and fish before an important match. I hope Alex (6) make a very successful career in football because he is a real sportsman. sleep
Р=(a+b)*2 подставим:
54=(4х+5х)*2 поделим обе части на два:
27=9х
х=3, значит а=3*4=12 и b=5*3=15
ответ: а=12, b=15