题目内容
(2011?历城区模拟)下面各题,怎样算简便就怎样算
4296-1296÷12+812 5.1÷0.17+2.6×6
×
÷
+
×
+
÷
12.5×0.32×25
÷(
+
)×
.
4296-1296÷12+812 5.1÷0.17+2.6×6
| 5 |
| 3 |
| 3 |
| 10 |
| 5 |
| 6 |
| 1 |
| 6 |
| 4 |
| 7 |
| 5 |
| 18 |
| 3 |
| 7 |
| 18 |
| 5 |
| 3 |
| 7 |
| 11 |
| 6 |
| 2 |
| 3 |
| 3 |
| 10 |
分析:第(1)题注意运算顺序,不要先算4296-1296,应先算除法;第(2)题注意在算除法时,去小数点的方法;
第(3)、(4)题要用到乘法分配律的逆运算;第(5)题要用乘法结合律进行运算,注意把0.32拆成0.8×0.4;
第(6)题注意运算顺序以及约分.
第(3)、(4)题要用到乘法分配律的逆运算;第(5)题要用乘法结合律进行运算,注意把0.32拆成0.8×0.4;
第(6)题注意运算顺序以及约分.
解答:解:(1)4296-1296÷12+812,
=4296-108+812,
=4188+812,
=5000;
(2)5.1÷0.17+2.6×6,
=30+15.6,
=45.6;
(3)
×
÷
+
,
=
×
+
,
=
+
,
=
;
(4)
×
+
÷
,
=
×
+
×
,
=(
+
)×
,
=
;
(5)12.5×0.32×25,
=(12.5×0.8)×(0.4×25),
=10×10,
=100;
(6)
÷(
+
)×
,
=
÷
×
,
=
×
×
,
=
.
=4296-108+812,
=4188+812,
=5000;
(2)5.1÷0.17+2.6×6,
=30+15.6,
=45.6;
(3)
| 5 |
| 3 |
| 3 |
| 10 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 1 |
| 2 |
| 6 |
| 5 |
| 1 |
| 6 |
=
| 3 |
| 5 |
| 1 |
| 6 |
=
| 23 |
| 30 |
(4)
| 4 |
| 7 |
| 5 |
| 18 |
| 3 |
| 7 |
| 18 |
| 5 |
=
| 4 |
| 7 |
| 5 |
| 18 |
| 3 |
| 7 |
| 5 |
| 18 |
=(
| 4 |
| 7 |
| 3 |
| 7 |
| 5 |
| 18 |
=
| 5 |
| 18 |
(5)12.5×0.32×25,
=(12.5×0.8)×(0.4×25),
=10×10,
=100;
(6)
| 3 |
| 7 |
| 11 |
| 6 |
| 2 |
| 3 |
| 3 |
| 10 |
=
| 3 |
| 7 |
| 15 |
| 6 |
| 3 |
| 10 |
=
| 3 |
| 7 |
| 6 |
| 15 |
| 3 |
| 10 |
=
| 9 |
| 175 |
点评:此题考查了运算顺序、运算定律、数的拆项以及约分等有关知识,重在考查学生灵活应变的能力.
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