题目内容
灵活计算.(能简便计算的要有简便方法计算) 1.2×0.5÷2.4 |
|
|
分析:(1)先调整运算顺序,即1.2÷2.4×0.5,计算即可;
(2)运用乘法分配律先计算(
+
)×45,然后再算加法;
(3)运用加法结合律简算.
(2)运用乘法分配律先计算(
2 |
15 |
7 |
9 |
(3)运用加法结合律简算.
解答:解:(1)1.2×0.5÷2.4,
=1.2÷2.4×0.5,
=0.5×0.5,
=0.25;
(2)
+(
+
)×45,
=
+[
×45+
×45],
=
+[6+35],
=
+41,
=41
;
(3)
+3.9++6.1,
=
+(3.9+6.1),
=
+10,
=10
.
=1.2÷2.4×0.5,
=0.5×0.5,
=0.25;
(2)
3 |
25 |
2 |
15 |
7 |
9 |
=
3 |
25 |
2 |
15 |
7 |
9 |
=
3 |
25 |
=
3 |
25 |
=41
3 |
25 |
(3)
1 |
14 |
=
1 |
14 |
=
1 |
14 |
=10
1 |
14 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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