题目内容
计算
(1)0×(-2008)×2009+(-1)÷(-2)
(2)(-32)×(
-
+
-
)
(3)-
+
÷(-2)×(-
)
(4)-24+3×(-1)4-(-4)×5.
(1)0×(-2008)×2009+(-1)÷(-2)
(2)(-32)×(
| 3 |
| 16 |
| 5 |
| 8 |
| 7 |
| 4 |
| 1 |
| 32 |
(3)-
| 5 |
| 2 |
| 28 |
| 5 |
| 5 |
| 14 |
(4)-24+3×(-1)4-(-4)×5.
分析:(1)先算乘法和除法,再算加法;
(2)利用乘法分配律简算;
(3)先算乘除混合运算,再算加法;
(4)先算乘方,再算乘法,最后算加减.
(2)利用乘法分配律简算;
(3)先算乘除混合运算,再算加法;
(4)先算乘方,再算乘法,最后算加减.
解答:解:(1)原式=0+0.5
=0.5;
(2)原式=(-32)×
-(-32)×
+(-32)×
-(-32)×
=-6-(-20)-56-(-1)
=-6+20-56+1
=-41;
(3)原式=-
+
×
×
=-
+1
=-
;
(4)原式=-16+3×1-(-20)
=-16+3+20
=7.
=0.5;
(2)原式=(-32)×
| 3 |
| 16 |
| 5 |
| 8 |
| 7 |
| 4 |
| 1 |
| 32 |
=-6-(-20)-56-(-1)
=-6+20-56+1
=-41;
(3)原式=-
| 5 |
| 2 |
| 28 |
| 5 |
| 1 |
| 2 |
| 5 |
| 14 |
=-
| 5 |
| 2 |
=-
| 3 |
| 2 |
(4)原式=-16+3×1-(-20)
=-16+3+20
=7.
点评:此题考查有理数的混合运算,注意运算顺序,抓住数字特点,灵活简算.
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