Привет, мне нужна помощь с домашней работой. Мое домашнее задание во вложениях. Решите пятый номер

Найти значение выражения:
a^2-b^2/2ab /(1/a-1/b) при a=4/3 и b=7/3  

1. найди правельную запись  выражения,  сумма  разность чисел семьсот  восемьдесят три и пятнадцать и частного чисел восемьдесят шесть и два

2.  найди 4/5 от числа 4800

3. 6т2ц+700кг=_______кг

4.  какое число надо вставить чтобы запись была  верной   6750<___<6900

а) 6700

б) 6000

в)6950

г)6800

 помагите пожалуйсто

Перевести предложения: 1.The cockerel has got a clock. 2. Nick has got a red pen.3.The cat has got a hat. 4.The pig has got a long stick. 5. Tim can`t swim.6.The fox has got a box.

Поставить слова в скобках в нужную (правильную) форму

Two weeks passed before we (hear)1 from Mr. Rochester again. We (inform)2 by his letter that he (return)3 in two days and (invite)4 a large number of ladies and gentlemen to stay for several days. Everybody was very busy as great preparations (make)5 for the party. At laSt the great day came. We watched from an upstairs window carriages (arrive)6. The guests (welcome)7 by their host and his housekeeper. Adele hoped that Mr. Rochester (call)8 her down to meet the guests when they all (arrive)9 but in the end she got so tired that she (fall)10 asleep very early. Those (be)11 cheerful, busy days and the old house never (see)12 ,so much life and activity. Mr. Rochester and Blanche always (ride)13-tOgether. Observing them closely, I (feel)14 very sure that he (marry)15 this fine lady very sOon though it was obvious that he not (give)16 her his heart.. One day, I (tell)17 by the housekeeper that the master wanted me (bring)18 Adele (introduce)19 to the guests. "If he (want)20 it, go, though it doesn't make me happy to meet so many new people," I thought.