题目内容

计算下面各题.
41×101
4.5-2.8-0.7 375+450÷18×25
12÷
4
5
÷0.6

12×(
1
4
+
1
6
-
1
3
)
[
5
8
-(
3
4
-
1
2
)]×6
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.
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÷
4
5
÷0.6,
=12×0.8÷0.6,
=9.6÷0.6,
=16;

(5)[
5
8
-(
3
4
-
1
2
)]×6,
=[
5
8
-
2
8
]×6,
=
3
8
×6,
=
9
4


(6)12×(
1
4
+
1
6
-
1
3
),
=12×
1
4
+12×
1
6
-12×
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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