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Sắp xếp những câu sau đây cho đúng:
1)It was /of you /to carry the bag /for me./very nine/
it was very nice of you to carry the bag for me
2)put the /of water./fish into /a bucket/The children/
the children put the fish into a bucket of water
3)where she /Can you/the country/tell me /was born?/
can you tell me the country where she was born?
4)in her /new clothes /Colin was/this morning ./very cheerful/
colin was very cheerful in her new clothes this morning
5)to our/Several toxic/health./gases are/very harmful/
several toxic gases are very harmful to our health
Sắp xếp những câu sau đây cho đúng:
1)It was /of you /to carry the bag /for me./very nine/
-> It was very nice to carry the bag of you for me.
2)put the /of water./fish into /a bucket/The children/
-> The children put the fish into a bucket of water.
3)where she /Can you/the country/tell me /was born?/
-> Can you tell me the country where she was born ?
4)in her /new clothes /Colin was/this morning ./very cheerful/
-> Colin was very cheerful in her new clothes this morning.
5)to our/Several toxic/health./gases are/very harmful/
-> Several toxic gases are very harmful to our health
Chúc học tốt!
Bài 249:
a, 2 x 3 x 2= 12(cm3)
b, 1 x 5 x 2 + 1 x 3 x 2= 16(cm3)
c, 2 x 5 x 1 + 2 x 2 x 2= 18(cm3)
a, \(P=\left(\sqrt{x}-\dfrac{x+2}{\sqrt{x}+1}\right):\left(\dfrac{\sqrt{x}}{\sqrt{x}+1}-\dfrac{\sqrt{x}-4}{1-x}\right)\)
\(=\left(\dfrac{x+\sqrt{x}}{\sqrt{x}+1}-\dfrac{x+2}{\sqrt{x}+1}\right):\left[\dfrac{\sqrt{x}\left(\sqrt{x}-1\right)}{\left(\sqrt{x}+1\right)\left(\sqrt{x}-1\right)}+\dfrac{\sqrt{x}-4}{\left(\sqrt{x}+1\right)\left(\sqrt{x}-1\right)}\right]\)
\(=\dfrac{\sqrt{x}-2}{\sqrt{x}+1}:\dfrac{x-4}{\left(\sqrt{x}+1\right)\left(\sqrt{x}-1\right)}\)
\(=\dfrac{\sqrt{x}-2}{\sqrt{x}+1}.\dfrac{\left(\sqrt{x}+1\right)\left(\sqrt{x}-1\right)}{\left(\sqrt{x}+2\right)\left(\sqrt{x}-2\right)}\)
\(=\dfrac{\sqrt{x}-1}{\sqrt{x}+2}\)
1 A
6 B
7 A
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