题目内容
(2013?武鸣县模拟)
×17-12×
91×
+9÷13-1÷13×100
67×
+
+
+
+
+
.
| 6 |
| 11 |
| 3 |
| 11 |
91×
| 1 |
| 13 |
67×
| 65 |
| 66 |
| 1 |
| 66 |
| 3 |
| 4 |
| 3 |
| 28 |
| 3 |
| 70 |
| 3 |
| 130 |
| 3 |
| 208 |
分析:(1)先变形为
×17-6×
,再根据乘法分配律简便计算;
(2)将除法变为乘法,再根据乘法分配律简便计算;
(3)根据乘法分配律和加法结合律简便计算;
(4)先拆项,再抵消即可求解.
| 6 |
| 11 |
| 6 |
| 11 |
(2)将除法变为乘法,再根据乘法分配律简便计算;
(3)根据乘法分配律和加法结合律简便计算;
(4)先拆项,再抵消即可求解.
解答:解:(1)
×17-12×
=
×17-6×
=
×(17-6)
=
×11
=6;
(2)91×
+9÷13-1÷13×100
=94×
+9×
-
×100
=(94+9-100)×
=3×
=
;
(3)67×
+
=(66+1)×
+
=66×
+(
+
)
=65+1
=66;
(4)
+
+
+
+
=1-
+
-
+
-
+
-
+
-
=1-
=
.
| 6 |
| 11 |
| 3 |
| 11 |
=
| 6 |
| 11 |
| 6 |
| 11 |
=
| 6 |
| 11 |
=
| 6 |
| 11 |
=6;
(2)91×
| 1 |
| 13 |
=94×
| 1 |
| 13 |
| 1 |
| 13 |
| 1 |
| 13 |
=(94+9-100)×
| 1 |
| 13 |
=3×
| 1 |
| 13 |
=
| 3 |
| 13 |
(3)67×
| 65 |
| 66 |
| 1 |
| 66 |
=(66+1)×
| 65 |
| 66 |
| 1 |
| 66 |
=66×
| 65 |
| 66 |
| 65 |
| 66 |
| 1 |
| 66 |
=65+1
=66;
(4)
| 3 |
| 4 |
| 3 |
| 28 |
| 3 |
| 70 |
| 3 |
| 130 |
| 3 |
| 208 |
=1-
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 7 |
| 1 |
| 7 |
| 1 |
| 10 |
| 1 |
| 10 |
| 1 |
| 13 |
| 1 |
| 13 |
| 1 |
| 16 |
=1-
| 1 |
| 16 |
=
| 15 |
| 16 |
点评:此题主要考查分数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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