题目内容
计算.
(1)(-
+
-
+
-
)×(-36);
(2)(-
)×0.01×(-1000)÷
×1
;
(3)-13×
-0.34×
+
×(-13)-
×0.34;
(4)(-18)÷2
×
÷(-16).
(1)(-
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 9 |
(2)(-
| 2 |
| 3 |
| 2 |
| 3 |
| 4 |
| 5 |
(3)-13×
| 2 |
| 3 |
| 2 |
| 7 |
| 1 |
| 3 |
| 5 |
| 7 |
(4)(-18)÷2
| 1 |
| 4 |
| 4 |
| 9 |
分析:(1)根据乘法分配律进行计算即可;
(2)从左到右依次计算即可;
(3)根据结合律进行计算即可;
(4)从左到右依次计算即可.
(2)从左到右依次计算即可;
(3)根据结合律进行计算即可;
(4)从左到右依次计算即可.
解答:解:(1)原式=(-
)×(-36)+
×(-36)-
×(-36)+
×(-36)-
×(-36)
=18-12+9-6+4
=6+9-6+4
=13;
(2)原式=(-
)×(-1000)×
×
=
×
×
=10×
=18;
(3)原式=[(-13)×(
+
)]-0.34×(
+
)
=(-13)-0.34
=-13.34;
(4)原式=(-18)×
×
×(-
)
=(-8)×
×(-
)
=(-
)×(-
)
=
.
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 9 |
=18-12+9-6+4
=6+9-6+4
=13;
(2)原式=(-
| 2 |
| 300 |
| 3 |
| 2 |
| 9 |
| 5 |
=
| 20 |
| 3 |
| 3 |
| 2 |
| 9 |
| 5 |
=10×
| 9 |
| 5 |
=18;
(3)原式=[(-13)×(
| 2 |
| 3 |
| 1 |
| 3 |
| 2 |
| 7 |
| 5 |
| 7 |
=(-13)-0.34
=-13.34;
(4)原式=(-18)×
| 4 |
| 9 |
| 4 |
| 9 |
| 1 |
| 16 |
=(-8)×
| 4 |
| 9 |
| 1 |
| 16 |
=(-
| 32 |
| 9 |
| 1 |
| 16 |
=
| 2 |
| 9 |
点评:本题考查的是有理数的混合运算,在解答此类问题时要注意各种运算律的灵活应用.
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