题目内容
(2012?东莞)
直接写出得数: 11-
|
9.63÷2.5÷4= | 0×36.67= | ||||||||||
0.25×0.3÷0.25×0.3= | 2
|
|
分析:(1)根据连续减去两个数等于减去这两个数的和简算;
(2)根据连续除以两个数等于除以这两个数的积简算;
(3)根据0乘任何数都得0简算;
(4)运用乘法结合律简算;
(5)先去掉括号,再计算,注意去括号时运算符号的改变;
(6)按照从左到右的顺序计算.
(2)根据连续除以两个数等于除以这两个数的积简算;
(3)根据0乘任何数都得0简算;
(4)运用乘法结合律简算;
(5)先去掉括号,再计算,注意去括号时运算符号的改变;
(6)按照从左到右的顺序计算.
解答:解:(1)11-
-
,
=11-(
+
),
=11-1,
=10;
(2)9.63÷2.5÷4,
=9.63÷(2.5×4),
=9.63÷10,
=0.963;
(3)0×36.67=0;
(4)0.25×0.3÷0.25×0.3,
=(0.25÷0.25)×(0.3×0.3),
=1×0.09,
=0.09;
(5)2
-(2
-
),
=2
-2
+
,
=0+
,
=
;
(6)
×
×1,
=
×1,
=
.
1 |
3 |
2 |
3 |
=11-(
1 |
3 |
2 |
3 |
=11-1,
=10;
(2)9.63÷2.5÷4,
=9.63÷(2.5×4),
=9.63÷10,
=0.963;
(3)0×36.67=0;
(4)0.25×0.3÷0.25×0.3,
=(0.25÷0.25)×(0.3×0.3),
=1×0.09,
=0.09;
(5)2
4 |
5 |
4 |
5 |
5 |
12 |
=2
4 |
5 |
4 |
5 |
5 |
12 |
=0+
5 |
12 |
=
5 |
12 |
(6)
2 |
3 |
9 |
10 |
=
3 |
5 |
=
3 |
5 |
点评:本题考查了基本的运算,要注意分析数据,选择合适的简算方法计算.
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