Wiki Exercise 8. Exchange the bold typed words by pronouns.
e.g: Pete lives here. I saw Pete yesterday. He lives here. I saw him yesterda
1. Alice is my girlfriend. I love Alice.
2. Jane and I saw Mark but Mark did not see Jane and me.
3. I told Steve and Carol to come to me.
4. My parents liked the cat and I bought the cat.
5. Why are the books on the table? Put the books on the shelf.
6. It is a nice bird. Listen how lovely the bird is singing.
7. Your friend and you are late again.
8. My sister and I are great friends.
9. I haven't seen Pete and Alex today.
10. Steve and Mark have invited my friend and me to the cinema.
Из подобия:
а) АВ/(АВ-5)=4/3, отсюда 3АВ=4АВ-20 и АВ=20. Значит А1В1=15.
ответ: АП=20см, АВ1=15см.
б) АВ/(АВ-6)=4/3, отсюда 3АВ=4АВ-24 и АВ=24. Значит А1В1=18.
ответ: АП=24см, АВ1=18см.
в) Площади подобных треугольников относятся как квадрат коэффициента подобия. то есть S1/S2=16/9, а S1+S2=400 или S2=400-S1. Тогда S1/(400-S1)=16/9, отсюда
9S1=16*400-16S1 или 25S1=6400ю. S1=256см², а S2=400-256=144см².
ответ: Sabc=256см² Sa1b1c1=144см²