试题

题目:
计算:
(1)
1
3
-
3
4
+
5
6
-
1
2

(2)
33
5
×(
1
3
-
1
2
15
22
×(-
12
9
)

(3)-24÷(-5)2×(-
5
8
)+|0.6-1|

答案
解:(1)原式=
4
12
-
9
12
+
10
12
-
6
12

=
4-9+10-6
12

=
-1
12

=-
1
12


(2)原式=
33
5
×(-
1
6
)×
15
22
×(-
12
9

=-
11
10
×
15
22
×(-
4
3

=(-
3
4
)×(-
4
3

=1;

(3)原式=(-16)÷25×(-
5
8
)+0.4
=(-
16
25
)×(-
5
8
)+0.4
=
2
5
+0.4
=0.8.
解:(1)原式=
4
12
-
9
12
+
10
12
-
6
12

=
4-9+10-6
12

=
-1
12

=-
1
12


(2)原式=
33
5
×(-
1
6
)×
15
22
×(-
12
9

=-
11
10
×
15
22
×(-
4
3

=(-
3
4
)×(-
4
3

=1;

(3)原式=(-16)÷25×(-
5
8
)+0.4
=(-
16
25
)×(-
5
8
)+0.4
=
2
5
+0.4
=0.8.
考点梳理
有理数的混合运算.
(1)先通分、再按照同分母的分数的加减法进行计算;
(2)先算括号内的数,再算乘法即可;
(3)先算乘方,再算乘法,最后算加减即可.
本题考查的是有理数的混合运算,在解答此类题目时要注意通分及约分的灵活运用.
计算题.
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