题目内容
计算下面各题. 41×101 |
4.5-2.8-0.7 | 375+450÷18×25 | |||||||||||||
12÷
12×(
|
[
|
分析:(1)把101看做100+1,运用乘法分配律简算;
(2)运用减法的性质简算;
(3)先算除法和乘法,再算加法;
(4)运用乘法分配律简算;
(5)先算小括号内的,再算中括号内的,最后算括号外的.
(2)运用减法的性质简算;
(3)先算除法和乘法,再算加法;
(4)运用乘法分配律简算;
(5)先算小括号内的,再算中括号内的,最后算括号外的.
解答:解:(1)41×101,
=41×(100+1),
=4100+41,
=4141;
(2)4.5-2.8-0.7,
=4.5-(2.8+0.7),
=4.5-3.5,
=1;
(3)375+450÷18×25,
=375+25×25,
=375+625,
=1000;
(4)12÷
÷0.6,
=12×0.8÷0.6,
=9.6÷0.6,
=16;
(5)[
-(
-
)]×6,
=[
-
]×6,
=
×6,
=
;
(6)12×(
+
-
),
=12×
+12×
-12×
,
=3+2-4,
=1.
=41×(100+1),
=4100+41,
=4141;
(2)4.5-2.8-0.7,
=4.5-(2.8+0.7),
=4.5-3.5,
=1;
(3)375+450÷18×25,
=375+25×25,
=375+625,
=1000;
(4)12÷
4 |
5 |
=12×0.8÷0.6,
=9.6÷0.6,
=16;
(5)[
5 |
8 |
3 |
4 |
1 |
2 |
=[
5 |
8 |
2 |
8 |
=
3 |
8 |
=
9 |
4 |
(6)12×(
1 |
4 |
1 |
6 |
1 |
3 |
=12×
1 |
4 |
1 |
6 |
1 |
3 |
=3+2-4,
=1.
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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