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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