化简求值:(1)求5(3a2b-ab2)-4(-ab2+3a2b)的值,其中a=

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问题:

化简求值:
(1)求5(3a2b-ab2)-4(-ab2+3a2b)的值,其中a=
1
2
b=-
1
3

(2)若2x2-3x+1=0,求代数式5x2-[5x2-4x2+2x+4x-5]的值.
考点:整式的加减
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用风险调整法估计债务成本时,()

A.税前债务成本=政府债券的市场回报率+企业的信用风险补偿率

B.税前债务成本=可比公司的债务成本+企业的信用风险补偿率

C.税前债务成本=股票资本成本+企业的信用风险补偿率

D.税前债务成本=无风险利率+证券市场的平均收益率

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把1-(a-b)2分解因式的结果是(  )

A.(1+a+b)(1-a+b)

B.(1+a-b)(1-a+b)

C.(1+a+b)(1-a-b)

D.(1+a-b)(1-a-b)

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when Frida Kahlo's painting were on show in London, a poet described her paintings as " a ribbon(丝带) around a bomb". Such comments seem to suggest Kahlo had a big influence on the art world of her time. Sadly, she is actually a much bigger name today than she was during her time.

Born in 1907 in a village near Mexico City, Kahlo suffered from polio(小儿麻癖) at the age of seven. Her spine(脊柱) became bent as she grew older . Then, in 1925, her back was broken in several places in a school-bus accident. Throughout the rest of her life, the artist had many operations, but nothing was able to cure the terrible pain in her back. However, the accident had an unexpected side effect. While lying in her bed recovering, Kahlo taught herself to paint.

In 1929, she got married to Diego Rivera, another famous Mexico artist. Rivera's strong influence on Kahlo's style can be seen in her early works, but her later works from the 1940s, known today as her best works, show less influence from her husband.

Unfortunately, her works did not attract much attention in the 1930s and 1940s, even in her home country. Her first one-woman show in Mexico was not held until 1953. For more than a decade after her death in 1954, Kahlo's works remained largely unnoticed by the world, but in the 1970s her works began to gain international fame at last.

小题1:What does the phrase “ a much bigger name” in Paragraph 1 most nearly mean?

A.a far better artist

B.a far more gifted artist

C.a much stronger person

D.a much more famous person小题2:The terrible pain Kahlo suffered was caused by        .

A.polio

B.her bent spine

C.back injuries

D.the operations she had小题3:Kahlo’s style had become increasingly independent since the          .

A.1930s

B.1940s

C.1950s

D.1970s小题4:What is the author’s attitude toward Kahlo?

A.devotion.

B.sympathy

C.worry.

D.encouragement.

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会员制期货交易所召开会员大会,应当将会议审议的事项于会议召开()前通知会员。

A.5日

B.7日

C.10日

D.15日

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热电阻温度计是基于导体和半导体的电阻值随温度而改变的特性而测温的()

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