Cho C= x⁷-26x⁶+27x⁵-47x⁴-77x³+50x²+x-24

tính C khi x=25

Cho B= x⁶ - 20x⁵ - 20x⁴- 20x³-20x²-20x+3

Tính B khi x= 21

1)Cho A= x⁵ - 100x⁴ + 100x³ -100x² +100x -9

 Tính A khi x=99

Bài tập: Chọn đáp án có ý nghĩa giống với câu gốc

1. I had already seen the film but I decided to watch it again last night.

a.I watched the film last night for the first time 

b.Last night wasn't the first time that I had seen the film

2The boys were playing football while it was raining 

a. the boys were playing football until it started to rain

b. the boys played football in the rain.

3.I was writingan email when our computer broke down

a.our computer broke down before I wrote an email

b. I had stared writing an email and then our computer broke down

4.My aunt bought me a lovely gift after she had spent the summer holiday with us 

a.when the summer holiday was over,my aunt bought me a lovely gift

b.while my aunt was spending the summer holiday with us,she bought us a lovely gift