题目内容
(2013?华亭县模拟)用你喜欢的方法计算下列各题.
12.06-0.5+0.5×0.2 | 7.4+0.38+0.22+2.6 | (
|
350÷
|
分析:(1)先算乘法,再算加法和减法;
(2)运用加法交换律与结合律简算;
(3)运用乘法分配律简算;
(4)把除法给位乘法,运用乘法分配律简算.
(2)运用加法交换律与结合律简算;
(3)运用乘法分配律简算;
(4)把除法给位乘法,运用乘法分配律简算.
解答:解:(1)12.06-0.5+0.5×0.2,
=12.06-0.5+0.1,
=12.02;
(2)7.4+0.38+0.22+2.6,
=(7.4+2.6)+(0.38+0.22),
=10+0.6,
=10.6;
(3)(
+
)×45,
=
×45+
×45,
=30+6,
=36;
(4)350÷
-350×
,
=350×
-350×
,
=350×(
-
),
=350×
,
=140.
=12.06-0.5+0.1,
=12.02;
(2)7.4+0.38+0.22+2.6,
=(7.4+2.6)+(0.38+0.22),
=10+0.6,
=10.6;
(3)(
2 |
3 |
2 |
15 |
=
2 |
3 |
2 |
15 |
=30+6,
=36;
(4)350÷
5 |
6 |
4 |
5 |
=350×
6 |
5 |
4 |
5 |
=350×(
6 |
5 |
4 |
5 |
=350×
2 |
5 |
=140.
点评:考查了小数、分数的四则混合运算,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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