题目内容
下面各题,怎样算简便就怎样算. 11×
|
| ||||||||||
|
2-
|
分析:(1)先变形为11×
-11×
再根据乘法分配律进行计算.
(2)据乘法交换律及结合律进行计算使计算更加简便.
(3)、(4)根据四则混合运算的运算顺序计算即可.
11 |
4 |
7 |
4 |
(2)据乘法交换律及结合律进行计算使计算更加简便.
(3)、(4)根据四则混合运算的运算顺序计算即可.
解答:解:(1)11×
-11÷
,
=11×
-11×
,
=11×(
-
),
=11×1,
=11;
(2)
×10×
,
=(
×
)×10,
=4×10,
=40;
(3)
÷(
-0.2),
=
÷(
-
),
=
÷(
-
),
=
÷
,
=
×
,
=
;
(4)2-
÷
-
,
=2-
×
-
,
=2-
-
,
=2-(
+
),
=2-2,
=0.
11 |
4 |
4 |
7 |
=11×
11 |
4 |
7 |
4 |
=11×(
11 |
4 |
7 |
4 |
=11×1,
=11;
(2)
5 |
2 |
8 |
5 |
=(
5 |
2 |
8 |
5 |
=4×10,
=40;
(3)
4 |
9 |
5 |
6 |
=
4 |
9 |
5 |
6 |
1 |
5 |
=
4 |
9 |
25 |
30 |
6 |
30 |
=
4 |
9 |
19 |
30 |
=
4 |
9 |
30 |
19 |
=
40 |
57 |
(4)2-
6 |
13 |
9 |
26 |
2 |
3 |
=2-
6 |
13 |
26 |
9 |
2 |
3 |
=2-
4 |
3 |
2 |
3 |
=2-(
4 |
3 |
2 |
3 |
=2-2,
=0.
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律简便计算.
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