题目内容
下面各题怎样简便就怎样算:
①3.7×99+3.7 | ②
| ③5.93+0.64+0.07+0.36 | ||||||
④(7.9-3.06+0.68)×1.5 | ⑤5.37-1.47-2.53 | ⑥1.5×(
|
考点:小数四则混合运算
专题:运算顺序及法则
分析:①⑥运用乘法的分配律进行计算即可.
②④根据四则混合运算的运算顺序计算即可.
③运用加法的交换律及结合律进行计算即可.
⑤一个数连续减去两个数,可以用这个数减去这两个数的和.
②④根据四则混合运算的运算顺序计算即可.
③运用加法的交换律及结合律进行计算即可.
⑤一个数连续减去两个数,可以用这个数减去这两个数的和.
解答:
解:①3.7×99+3.7
=3.7×(99+1)
=3.7×100
=370
②
+
-
=
+
-
=
+
=
③5.93+0.64+0.07+0.36
=(5.93+0.07)+(0.64+0.36)
=6+1
=7
④(7.9-3.06+0.68)×1.5
=5.52×1.5
=8.28
⑤5.37-1.47-2.53
=5.37-(1.47+2.53)
=5.37-4
=1.37
⑥1.5×(
+
)
=1.5×
+
×1.5
=0.5+0.3
=0.8
=3.7×(99+1)
=3.7×100
=370
②
3 |
4 |
1 |
6 |
3 |
8 |
=
6 |
8 |
1 |
6 |
3 |
8 |
=
3 |
8 |
1 |
6 |
=
13 |
24 |
③5.93+0.64+0.07+0.36
=(5.93+0.07)+(0.64+0.36)
=6+1
=7
④(7.9-3.06+0.68)×1.5
=5.52×1.5
=8.28
⑤5.37-1.47-2.53
=5.37-(1.47+2.53)
=5.37-4
=1.37
⑥1.5×(
1 |
3 |
1 |
5 |
=1.5×
1 |
3 |
1 |
5 |
=0.5+0.3
=0.8
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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