题目内容
计算:
(1)
-
+
-
(2)
×(
-
)×
×(-
)
(3)-24÷(-5)2×(-
)+|0.6-1|.
(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 |
分析:(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.
(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.
解答:解:(1)原式=
-
+
-
=
=
=-
;
(2)原式=
×(-
)×
×(-
)
=-
×
×(-
)
=(-
)×(-
)
=1;
(3)原式=(-16)÷25×(-
)+0.4
=(-
)×(-
)+0.4
=
+0.4
=0.8.
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 |
=(-
16 |
25 |
5 |
8 |
=
2 |
5 |
=0.8.
点评: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.
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