题目内容
用你喜欢的方法计算:
39×11 |
|
36×(
| ||||||||||||||
(3-1.4)÷
|
1×
|
|
分析:(1)把11拆成10+1,然后再根据乘法分配律进行简算;
(2)根据乘法分配律进行简算;
(3)根据乘法分配律进行简算;
(4)先算小括号里面的减法.再算除法;
(5)根据乘法分配律进行简算;
(6)=按照从左向右的顺序进行计算.
(2)根据乘法分配律进行简算;
(3)根据乘法分配律进行简算;
(4)先算小括号里面的减法.再算除法;
(5)根据乘法分配律进行简算;
(6)=按照从左向右的顺序进行计算.
解答:解:
(1)39×11,
=39+(10+1),
=39×10+39×1,
=390+39,
=429;
(2)
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)36×(
+
+
),
=36×
+36×
+36×
,
=8+30+21,
=38+21,
=59;
(4)(3-1.4)÷
,
=1.6÷
,
=3.2;
(5)1×
-80%÷
,
=1×
-80%×
,
=(1-80%)×
,
=0.2×
,
=
;
(6)
÷
÷
,
=
÷
,
=
.
(1)39×11,
=39+(10+1),
=39×10+39×1,
=390+39,
=429;
(2)
5 |
7 |
1 |
4 |
3 |
4 |
5 |
7 |
=
5 |
7 |
1 |
4 |
3 |
4 |
=
5 |
7 |
=
5 |
7 |
(3)36×(
2 |
9 |
5 |
6 |
7 |
12 |
=36×
2 |
9 |
5 |
6 |
7 |
12 |
=8+30+21,
=38+21,
=59;
(4)(3-1.4)÷
1 |
2 |
=1.6÷
1 |
2 |
=3.2;
(5)1×
4 |
5 |
5 |
4 |
=1×
4 |
5 |
4 |
5 |
=(1-80%)×
4 |
5 |
=0.2×
4 |
5 |
=
4 |
25 |
(6)
9 |
10 |
3 |
5 |
2 |
7 |
=
3 |
2 |
2 |
7 |
=
21 |
4 |
点评:四则运算,先弄清运算顺序,然后再进一步计算即可,能简算的要简算.

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