题目内容
计算:(1)(-2
| 1 |
| 3 |
| 5 |
| 6 |
| 1 |
| 6 |
(2)-13-(1+0.5)×
| 1 |
| 3 |
(3)(-1)3×(-5)÷[(-3)2+2×(-5)]
(4)3.34×(-22)+5.84×|-4|-(
| 5 |
| 12 |
| 3 |
| 4 |
| 2 |
| 3 |
分析:运用有理数的运算法则,注意运算顺序,先算乘方,再算乘除,后算加减.
解答:解:(1)-2
+(-2
)+(-
)+(-0.5)+(+1
),
=-
-
-
-
+
,
=-5;
(2)-13-(1+0.5)×
÷(-4),
=-1-
×
×(-
),
=-1+
,
=-
;
(3)(-1)3×(-5)÷[(-3)2+2×(-5)],
=-1×(-5)÷(9-10),
=5÷(-1),
=-5;
(4)3.34×(-22)+5.84×|-4|-(
-
+
)×12,
=3.34×(-4)+5.84×4-5+9-8,
=(5.84-3.34)×4-4,
=2.5×4-4,
=6.
| 1 |
| 2 |
| 1 |
| 3 |
| 5 |
| 6 |
| 1 |
| 6 |
=-
| 5 |
| 2 |
| 7 |
| 3 |
| 5 |
| 6 |
| 1 |
| 2 |
| 7 |
| 6 |
=-5;
(2)-13-(1+0.5)×
| 1 |
| 3 |
=-1-
| 3 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=-1+
| 1 |
| 8 |
=-
| 7 |
| 8 |
(3)(-1)3×(-5)÷[(-3)2+2×(-5)],
=-1×(-5)÷(9-10),
=5÷(-1),
=-5;
(4)3.34×(-22)+5.84×|-4|-(
| 5 |
| 12 |
| 3 |
| 4 |
| 2 |
| 3 |
=3.34×(-4)+5.84×4-5+9-8,
=(5.84-3.34)×4-4,
=2.5×4-4,
=6.
点评:此题主要考查了有理数的运算法则,应注意运算顺序,以及符号问题.
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