题目内容
计算下面各题能简算的要间算. 36×(
|
3×(
| ||||||||||||||
|
[
|
分析:(1)根据乘法分配律进行简算;
(2)先根据乘法分配律进行简算,再根据加法结合律进行简算;
(3)根据乘法分配律进行简算;
(4)先算小括号里面的减法,再算中括号里面的减法,最后算除法.
(2)先根据乘法分配律进行简算,再根据加法结合律进行简算;
(3)根据乘法分配律进行简算;
(4)先算小括号里面的减法,再算中括号里面的减法,最后算除法.
解答:解:(1)36×(
+
-
)
=36×
+36×
-36×
=24+6-27
=30-27
=3;
(2)3×(
+
)-
=3×
+3×
-
=
+
-
=
+(
-
)
=
;
(3)
÷9+
×
=
×
+
×
=
×(
+
)
=
×
=
;
(4)[
-(
-
)]÷
=[
-
]÷
=
÷
=
.
2 |
3 |
1 |
6 |
3 |
4 |
=36×
2 |
3 |
1 |
6 |
3 |
4 |
=24+6-27
=30-27
=3;
(2)3×(
2 |
15 |
1 |
12 |
1 |
4 |
=3×
2 |
15 |
1 |
12 |
1 |
4 |
=
2 |
5 |
1 |
4 |
1 |
4 |
=
2 |
5 |
1 |
4 |
1 |
4 |
=
2 |
5 |
(3)
9 |
16 |
1 |
9 |
9 |
16 |
=
9 |
16 |
1 |
9 |
1 |
9 |
9 |
16 |
=
9 |
16 |
1 |
9 |
1 |
9 |
=
9 |
16 |
2 |
9 |
=
1 |
8 |
(4)[
5 |
12 |
1 |
6 |
1 |
8 |
3 |
4 |
=[
5 |
12 |
1 |
24 |
3 |
4 |
=
3 |
8 |
3 |
4 |
=
1 |
2 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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