题目内容
(2008?江都市模拟)
|
分析:算式(2)可据一个数除以两个数等于除以这两个数的积的除法性质进行计算;
算式(4)用凑整法将原式变为4.3×100-4.3进行简便计算;
其余算式根据四则混合运算法则计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
算式(4)用凑整法将原式变为4.3×100-4.3进行简便计算;
其余算式根据四则混合运算法则计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
解答:解:(1)360÷15-2.5×1.4,
=24-3.5,
=20.5;
(2)560÷16÷5,
=560÷(16×5),
=560÷80,
=7;
(3)
+
×
-
,
=
+
-
,
=
-
,
=
;
(4)4.3×99,
=4.3×100-4.3,
=430-4.3,
=425.7;
(5)76÷7.6+2.4,
=10+2.4,
=12.4;
(6)
×[
÷(
-
)]
=
×[
× 12],
=
×
,
=4.
=24-3.5,
=20.5;
(2)560÷16÷5,
=560÷(16×5),
=560÷80,
=7;
(3)
3 |
7 |
4 |
7 |
3 |
4 |
3 |
4 |
=
3 |
7 |
3 |
7 |
3 |
4 |
=
6 |
7 |
3 |
4 |
=
3 |
28 |
(4)4.3×99,
=4.3×100-4.3,
=430-4.3,
=425.7;
(5)76÷7.6+2.4,
=10+2.4,
=12.4;
(6)
3 |
8 |
8 |
9 |
5 |
6 |
3 |
4 |
=
3 |
8 |
8 |
9 |
=
3 |
8 |
32 |
3 |
=4.
点评:完成小数加减法时要注意小数点的对齐,完成小数乘除法时要注意小数点位置的移动.
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