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41. 解：原式＝－2

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40. 解：原式＝2+1－9+1 ································································································ 4分

　　　　　　 ＝－5　······································································································ 6分

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39. 解：

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38.

解：原式=

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37.

解：原式

　　　　　　

　　　　　　

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36. 解：原式=-2+1………………………………………………6分

　　　　　　　 =3-(2-)+1……………………………………………7分

　　　　　　　 =2+………………………………………………………8分

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35.　　　　

解：=·············································································· 4分

　　　　 =0 ·················································································································· 6分

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34. 解：原式

　　　　　　　　　 　

　　　　　　　　　 　　　

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33.　 解：原式＝5+1-＝5

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32. 解：原式= 2－+－1　 =1.

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