Đặt c.rộng là x, c. dài là y! Ta có:

( Dùng tính chất phân phối của phép nhân, phép cộng)

Rồi dùng bài toán tổng - hiệu để giải tiếp

1.I've never met any more dependable person than George.

=> George is the most dependable person I've ever met.

2.There isn't anybody as kind-hearted as your mother.

=> Your mother is the most kind hearted person .

3.Mr John is the best teacher in this school.

=> Mr John is the best teacher in this school.

4.She can run  faster than me

=> I can not run as fast as her

5.My house is bigger than her house

=> Her house is smaller than mine.