试题与答案

在下列括号内填上使等式成立的分子或分母:(1)2x3y=()6xy=6xy()=

题型:填空题

题目:

在下列括号内填上使等式成立的分子或分母:
(1)
2x
3y
=
(  )
6xy
=
6xy
(  )
=
100x2y2
(  )

(2)
1
a-4
=
(  )
a2-16

(3)
2a2-2ab
a-b
=
2a
(  )

(4)
2x2+2xy
x+y
=
2x
(  )

(5)1-m=-
(  )
m+1

(6)
-2x
1-2x
=
(  )
2x2-x

(7)
a2-3ab+b2
ab
=
(  )
ab
-3.

答案:

(1)

2x
3y
=
4x2
6xy
=
6xy
3y2
=
100x2y2
150xy3

(2)

1
a-4
=
a+4
a2-16

(3)

2a2-2ab
a-b
=
2a(a-b)
a-b
=
2a
1

(4)

2x2+2xy
x+y
=
2x(x+y)
x+y
=
2x
1

(5)1-m=-(m-1)=-

m2-1
m+1

(6)

-2x
1-2x
=
2x2
2x2-x

(7)

a2-3ab+b2
ab
=
a2+b2
ab
-3.

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I have recently been diagnosed with an addiction-to coffee. And I am not alone. This is a problem among Americans of all ages. The coffee shop has become a social feature in our culture. Its appealing smell, cozy and inviting atmosphere are difficult to resist, especially if you struggle with an addiction like alcohol.

But, when you look past the leather couches and coffees named after European cities, all you'll find is coffee, milk, and a little sugar. Anyone can buy a Coffeemaker and a container of Coffee Mate and try to create the same drink as a coffee shop does. The only difference between your homemade coffee and coffee shops is that they put it in a cute cup and throw on some whipped (泡沫状的) cream to convince us that we are treating ourselves to a worthy relief from the fast pace of everyday life. And we believe them, silly for the idea that drinking their coffee improves our quality of life.

So, next time this "white chocolate" begins echoing in your mind, you'll have to make a decision: Will you continue to be one of the millions of brainwashed Americans who live for their next trip to a coffee shop, or will you just walk away and ignore it? My advice is -- dare to resist and just say no.

61. The major features of a coffee shop are the following EXCEPT its _______.

A. attractive smell                                      B. comfortable surrounding

C. pleasant atmosphere                                D. alcohol-like addiction

62. The coffee from coffee shops differs from homemade coffee mainly because it _______.

A. is mixed with whipped cream                B. is usually served in a cute cup

C. offers a feeling of precious relief               D. can improve the quality of life

63. "White chocolate" in the last paragraph probably means _______.

A. coffee with cream                             B. chocolate with coffee

C. brainwashed Americans                      D. addiction to shop coffee

64. The author's attitude towards "white chocolate" is _______.

A. positive             B. uncaring          C. negative             D. optimistic

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