Đáp án:
Giải thích các bước giải:
1) x2-7x=0
x(x-7)=0
=>x=0 hoặc x-7=0
x=7
2) 2x2-6x=0 2x(x-3)=0
x(x-3)=0
=>x=0 hoặc x-3=0
x=3
3)x2+2x=0
x(x+2)=0
=>x=0 hoặc x+2=0
x=-2
4)8x2-4x=0
4x(2x-1)=0
x(2x-1)=0
=>x=0 hoặc 2x-1=0
x=1/2
1) X(2-7)=0
X.(-5)=0
X=0:(-5)
X=0
vậy....
2) 2.X(2-6)=0
2.X.(-4)=0
2.X=0.(-4)
2.X=0
X=0:2
vậy ...
3)X(2+2)=0
X.4=0
X=0-4
vậy ....
4)8.X(2-4)=0
8.X.(-2)=0
8.X=0:(-2)
8.X=0
X=0:8
vậy...
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I. Choose the best answer. 1. It looks like they are going to succeed ................... their present difficulties. A. despite B. Although C. In spite D. Whereas 2. I like spending my holiday in the mountain ... ………….my wife prefer the sea. A. Despite B. Whereas C. Although D. In spite 3. .................... he wasn't feeling very well. Alex was determined to take part in the race. A. Despite the fact that B. Despite the fact it C. Despite of D. In spite 4. I went to the cinema last night ......................... it rained. A. Despite B. Although C. In spite D. Whereas 5. ............................... being fond of music. I can't play instruments. A. Despite B. Whereas C. Although D. In spite II. Complete the sentences, using although, despite, in spite of, however, or nevertheless. Sometimes, two answers are possible. 1. it was raining heavily, he went out without a raincoat. 2. My father is very busy. , he is always willing to give a hand with the housework. 3. Some English words have the same pronunciation they are spelled differently, for example, dear and deer. 4. I was cold and wet. , Bob put on his swimming suit and went to the beach. 5. I think I did OK in my speech last night I’d had almost no sleep for 24 hours. 6. Carol arrived at the meeting I asked her not to be there. 7. The sky was grey and cloudy. , we went to the beach. 8. It looks like they’re going to succeed their present difficulties. 9. there was no electricity, I was able to read because I had a candle. 10. I heard the telephone ring, I didn’t answer it. III.Use “although” to combine each pair of these sentences. 1. He often tells lies. Many people believe him. ……………………………………………………………………………………….. 2. She didn’t eat much. She was hungry. ……………………………………………………………………………………….. 3. It got dark. They continued to work. ……………………………………………………………………………………….. 4. He is very strong. I’m not afraid of him. ……………………………………………………………………………………….. 5. He didn’t stop his car. The traffic lights turned red. ……………………………………………………………………………………….. IV. Change these sentences using the expressions in brackets. 1. Tom will not pass the examination even though he studied well. (despite) _________________________________________________________________________________ 2. Despite not having enough money, we decided to hold a party. (though) _________________________________________________________________________________ 3. He took a lot of photographs even though the sky was dark. (despite) _________________________________________________________________________________ 4. Despite his hard life, he studied very well. (though) _________________________________________________________________________________ 5. In spite of living in poverty, they were always admired. (although) _________________________________________________________________________________ 6. He passed the final examination even though he was frequently absent from class. (in spite of) _________________________________________________________________________________ 7. She is still fat even though she has been on a diet for 2 years. (despite) _________________________________________________________________________________ 8. Although she doesn’t earn much money, she spends like a millionaire. (in spite of) _________________________________________________________________________________ 9. He went to bed early even though he didn’t finish his lessons. (despite) _________________________________________________________________________________ 10. Remember to treat him well even though you don’t like him. (in spite of)
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