chứng minh rằng

a(b-c)(b+c-a)²+c(a-b)(a+b-c)²=b(a-c)(a+c-b)²

EX 1:Complete the second sentence, using the word given at the end of the first sentence so that it remains the same meaning as the first one
1.They haven’t talked to each other for two years. SINCE

It’s________________________________________________________________________ to each other

2.She has never heard such a ridiculous lie. MOST

It’s the _______________________________________________________________________ever heard

3.They have never been to a Chinese restaurant before. FIRST

It’s the _____________________________________________________________ to a Chinese restaurant

4.My brother always told lies when he was little. USED TO

My brother______________________________________________________________ when he was little

5.She didn’t wake up early, but now she does. USED

She ______________________________________________________________________________ early

6.I don’t think I’ll ever find it easy to accept insults. USED

I don’t think I’ll ever _______________________________________________________________ insults

7.She rarely wears jeans. USED

She ______________________________________________________________________________ jeans
EX 2:It is + adj ….

1. Roses can’t possibly grow in such poor ground.

It is impossible………………………………………………..………………………………………………

2. Handicapped people find shopping in supermarkets difficult.

It is difficult……………………………………………………………………………………………………

3. It is pointless to have that old typewrites repaired.

That old typewriter is not…………………………………..…………………………………………………

4. It is hardly likely that he took poison.

He is ...................................................................................................................................................................

5. It’s difficult to answer her question adequately.

Hers is ..............................................................................................................................................................

EX 3:Clauses

1.Although he didn’t speak Dutch, Bob decided to settle in Amsterdam.

In spite …………………………………………………………………………………………………………

2.In spite of his age, Mr. Benson runs seven miles before breakfast.

Although………………………………………………………...………………………………………………

3.He managed to complete the sculpture although his eyesight was failing.

Despite .............................................................................................................................................................

4.Although it rained torrentially all day, we all enjoyed the excursion.

Despite ................................................................................................................................................................

5.Although he was very tired, he agreed to play tennis.

Tired ...................................................................................................................................................................

6.In spite of the forecast it stayed fine.

Although rain ....................................................................................................................................................

7.Although Christopher was the stronger of the two, his attacker soon overpowered him.

Despite his ........................................................................................................................................................

8.Although Judy was severely disabled she participated in many sports.

Despite her .......................................................................................................................................................

=\(\frac{6}{2\left(1+2\right)}=\frac{6}{2.3}=\frac{6}{6}=1\)

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