题目内容
(2012?西峡县)
下面各题怎样简便就怎样算. (1)3.7×99+3.7 |
(2)
|
(3)5.93+0.64+0.07+0.36 | ||||||
(4)(7.9-3.06÷0.68)×1.5 | (5)5.37-1.47-2.53 | (6)105×(
|
分析:(1)运用乘法分配律简算;
(2)运用加法交换律简算,交换位置时注意运算符号;
(3)运用加法结合律简算;
(4)先算小括号里面的除法,再算小括号里面的减法,最后算括号外的除法;
(5)根据连续减去两个数等于减去这两个数的和简算;
(6)运用乘法分配律简算.
(2)运用加法交换律简算,交换位置时注意运算符号;
(3)运用加法结合律简算;
(4)先算小括号里面的除法,再算小括号里面的减法,最后算括号外的除法;
(5)根据连续减去两个数等于减去这两个数的和简算;
(6)运用乘法分配律简算.
解答:解:(1)3.7×99+3.7,
=3.7×(99+1),
=3.7×100,
=370;
(2)
+
-
,
=
-
+
,
=
+
,
=
;
(3)5.93+0.64+0.07+0.36,
=(5.93+0.07)+(0.64+0.36),
=6+1,
=7;
(4)(7.9-3.06÷0.68)×1.5,
=(7.9-4.5)×1.5,
=3.4×1.5,
=5.1;
(5)5.37-1.47-2.53,
=5.37-(1.47+2.53),
=5.37-4,
=1.37;
(6)105×(
+
),
=105×
+105×
,
=35+21,
=56.
=3.7×(99+1),
=3.7×100,
=370;
(2)
3 |
4 |
1 |
6 |
3 |
8 |
=
3 |
4 |
3 |
8 |
1 |
6 |
=
3 |
8 |
1 |
6 |
=
13 |
24 |
(3)5.93+0.64+0.07+0.36,
=(5.93+0.07)+(0.64+0.36),
=6+1,
=7;
(4)(7.9-3.06÷0.68)×1.5,
=(7.9-4.5)×1.5,
=3.4×1.5,
=5.1;
(5)5.37-1.47-2.53,
=5.37-(1.47+2.53),
=5.37-4,
=1.37;
(6)105×(
1 |
3 |
1 |
5 |
=105×
1 |
3 |
1 |
5 |
=35+21,
=56.
点评:本题考查了基本的简便运算的方法,特别是对运算定律的使用;要记住这些简算的形式,能灵活运用.
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