题目内容
用你喜欢的方法进行计算．
1
×17.6+36÷
+2.64×12.5
×23
+16×
+
×
139×
+137×
．
1
| 1 |
| 4 |
| 4 |
| 5 |
| 4 |
| 7 |
| 12 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 4 |
| 13 |
139×
| 137 |
| 138 |
| 1 |
| 138 |
考点：分数的四则混合运算
专题：运算顺序及法则
分析：（1）（2）通过数字转化，运用乘法分配律计算
（3）原式变为139×
+
，运用乘法分配律简算．
（3）原式变为139×
| 137 |
| 138 |
| 137 |
| 138 |
解答：
解：（1）1
×17.6+36÷
+2.64×12.5
=1.25×17.6+36×1.25+26.4×1.25
=1.25×（17.6+36+26.4）
=1.25×80
=100
（2）
×23
+16×
+
×
=
×
+16×
+
×
=
×
+16×
+
×
=
×（
+16+
）
=
×112
=16
（3）139×
+137×
=139×
+
=（139+1）×
=140×
=（138+2）×
=138×
+2×
=137+1
=138
| 1 |
| 4 |
| 4 |
| 5 |
=1.25×17.6+36×1.25+26.4×1.25
=1.25×（17.6+36+26.4）
=1.25×80
=100
（2）
| 4 |
| 7 |
| 12 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 4 |
| 13 |
=
| 4 |
| 7 |
| 311 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 4 |
| 13 |
=
| 1 |
| 7 |
| 1244 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 4 |
| 13 |
=
| 1 |
| 7 |
| 1244 |
| 13 |
| 4 |
| 13 |
=
| 1 |
| 7 |
=16
（3）139×
| 137 |
| 138 |
| 1 |
| 138 |
=139×
| 137 |
| 138 |
| 137 |
| 138 |
=（139+1）×
| 137 |
| 138 |
=140×
| 137 |
| 138 |
=（138+2）×
| 137 |
| 138 |
=138×
| 137 |
| 138 |
| 137 |
| 138 |
=137+1
| 68 |
| 69 |
=138
| 68 |
| 69 |
点评：此题考查了乘法分配律的灵活运用情况．
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