9. замените определительные придаточные предложения оборотом с причастием i. 1. when i was studying advertising materials, our manager found out many interesting things. 2. he was reading the letter, when he was talking to somebody on the phone. 3. we managed to sell more goods after we had reduced the price. 4. last week my secretary sent you the letter in which she pointed out the prices for our goods. 5. he left after he had discussed the terms of delivery.

ответ: за   2 часа первый и за 2,5 часа второй участок.

пошаговое объяснение: пусть за х часов мотоциклист проехал первый участок, тогда второй за х+0,5 часов. расстояние первого участка будет 42х км, а второго 30(х+0,5) км. всего мотоциклист проехал 159 км. составим уравнение:

42х+30(х+0,5)=159

42х+30х+15=159

72х=144

х=2 (ч). за 2 часа мотоциклист проехал первый участок.

2+0,5=2,5 (ч). за 2,5 часа мотоциклист проехал второй участок.

1. when i was studying advertising materials, our manager found out many interesting things. -  нельзя изменить, так как речь о разных объектах

2. he was reading the letter while talking to somebody on the phone. 

3. we managed to sell more goods after having reduced the price.

4. last week my secretary sent you the letter pointing out the prices for our goods.

5. he left after having discussed the terms of delivery.

объяснение:

i very often go shopping with my mom.

we always go to the supermarket which have lots of types of fish because our dad loves fish. also after buying fish we sometimes go to different accessories and clothes shops. i like gucci. however gucci is very expensive for us so we buy clothes in bargain and cheque.