题目内容
(2013?高碑店市)计算.(能简算的要简算)
560+1440÷12×5
3.5÷0.125×8
8×(
+
)+
×
+
×
.
560+1440÷12×5
3.5÷0.125×8
8×(
| 3 |
| 8 |
| 1 |
| 27 |
| 19 |
| 27 |
| 5 |
| 8 |
| 11 |
| 10 |
| 3 |
| 8 |
| 11 |
| 10 |
分析:(1)先算除法,再算乘法,最后算加法;
(2)按照从左到右的顺序计算,不能先算乘法,再算除法;
(3)先运用乘法分配律简算,再运用加法结合律简算;
(4)运用乘法分配律简算.
(2)按照从左到右的顺序计算,不能先算乘法,再算除法;
(3)先运用乘法分配律简算,再运用加法结合律简算;
(4)运用乘法分配律简算.
解答:解:(1)560+1440÷12×5,
=560+120×5,
=560+600,
=1160;
(2)3.5÷0.125×8,
=28×8,
=224;
(3)8×(
+
)+
,
=8×
+
×8+
,
=3+
+
,
=3+(
+
),
=3+1,
=4;
(4)
×
+
×
,
=(
+
)×
,
=1×
,
=
.
=560+120×5,
=560+600,
=1160;
(2)3.5÷0.125×8,
=28×8,
=224;
(3)8×(
| 3 |
| 8 |
| 1 |
| 27 |
| 19 |
| 27 |
=8×
| 3 |
| 8 |
| 1 |
| 27 |
| 19 |
| 27 |
=3+
| 8 |
| 27 |
| 19 |
| 27 |
=3+(
| 8 |
| 27 |
| 19 |
| 27 |
=3+1,
=4;
(4)
| 5 |
| 8 |
| 11 |
| 10 |
| 3 |
| 8 |
| 11 |
| 10 |
=(
| 5 |
| 8 |
| 3 |
| 8 |
| 11 |
| 10 |
=1×
| 11 |
| 10 |
=
| 11 |
| 10 |
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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