试题

题目:
计算:
(1)33×(-
1
3
)
3
-2÷(-
1
2
)
3

(2)(-4)2÷(-2)3-(-7)
(3)(-1)4-[(-2)3-(-3)3]÷(-19)
(4)(-1
3
5
)
2
÷(-
3
5
)×(-
5
12
)

(5)-14-
1
3
[2-(-3)2]
(6)(-1)2010+(-4)2010×(-
1
4
)
2009

(7)-32+(-2
1
2
)
2
×(-
4
25
)+|-22|

(8)[-53-(-3)3]÷[(-5)-(-3)].
答案
解:(1)33×(-
1
3
)
3
-2÷(-
1
2
)
3

=27×(-
1
27
)-2÷(-
1
8

=-1+16
=15;

(2)(-4)2÷(-2)3-(-7)
=16÷(-8)+7
=-2+7
=5;

(3)(-1)4-[(-2)3-(-3)3]÷(-19)
=1-[-8+27]÷(-19)
=1-19÷(-19)
=1+1
=2;

(4)(-1
3
5
)
2
÷(-
3
5
)×(-
5
12
)

=
64
25
×
5
3
×
5
12

=
16
9


(5)-14-
1
3
[2-(-3)2]

=-1-
1
3
×[2-9]
=-1-
1
3
×[-7]
=-1+
7
3

=
4
3


(6)(-1)2010+(-4)2010×(-
1
4
)
2009

=1+(-4)×[(-4)×(-
1
4
)]2009
=1+(-4))×12009
=1+(-4)×1
=1-4
=-3;

(7)-32+(-2
1
2
)
2
×(-
4
25
)+|-22|

=-9+
25
4
×(-
4
25
)+4
=-9-1+4
=-6;

(8)[-53-(-3)3]÷[(-5)-(-3)]
=[-125+27]÷(-2)
=98÷2
=49.
解:(1)33×(-
1
3
)
3
-2÷(-
1
2
)
3

=27×(-
1
27
)-2÷(-
1
8

=-1+16
=15;

(2)(-4)2÷(-2)3-(-7)
=16÷(-8)+7
=-2+7
=5;

(3)(-1)4-[(-2)3-(-3)3]÷(-19)
=1-[-8+27]÷(-19)
=1-19÷(-19)
=1+1
=2;

(4)(-1
3
5
)
2
÷(-
3
5
)×(-
5
12
)

=
64
25
×
5
3
×
5
12

=
16
9


(5)-14-
1
3
[2-(-3)2]

=-1-
1
3
×[2-9]
=-1-
1
3
×[-7]
=-1+
7
3

=
4
3


(6)(-1)2010+(-4)2010×(-
1
4
)
2009

=1+(-4)×[(-4)×(-
1
4
)]2009
=1+(-4))×12009
=1+(-4)×1
=1-4
=-3;

(7)-32+(-2
1
2
)
2
×(-
4
25
)+|-22|

=-9+
25
4
×(-
4
25
)+4
=-9-1+4
=-6;

(8)[-53-(-3)3]÷[(-5)-(-3)]
=[-125+27]÷(-2)
=98÷2
=49.
考点梳理
有理数的混合运算.
按照有理数混合运算的顺序,先乘方后乘除最后算加减,有括号的先算括号里面的.
本题考查的是有理数的运算能力.注意:
(1)要正确掌握运算顺序,在混合运算中要特别注意运算顺序:先三级,后二级,再一级;有括号的先算括号里面的;同级运算按从左到右的顺序;
(2)去括号法则:--得+,-+得-,++得+,+-得-.
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