题目内容
(2013?富源县模拟)怎样简便就怎样计算.
|
91-10÷0.25÷4 | ||||||||||||
|
35÷[
| ||||||||||||
| 41×101 | 5×
| ||||||||||||
| 8.5-(5.6+4.8)÷1.3 | 12×(
|
分析:(1)根据连减的性质进行计算;
(2)根据连除的性质进行计算;
(3)根据乘法分配律进行计算;
(4)先算减法,再算乘法,最后算除法;
(5)根据乘法分配律进行计算;
(6)根据乘法交换律和结合律进行计算;
(7)先算加法,再算除法,最后算减法;
(8)根据乘法分配律进行计算.
(2)根据连除的性质进行计算;
(3)根据乘法分配律进行计算;
(4)先算减法,再算乘法,最后算除法;
(5)根据乘法分配律进行计算;
(6)根据乘法交换律和结合律进行计算;
(7)先算加法,再算除法,最后算减法;
(8)根据乘法分配律进行计算.
解答:解:
(1)
-(
+
),
=
-
-
,
=1-
,
=
;
(2)91-10÷0.25÷4,
=91-10÷(0.25×4),
=91-10÷1,
=91-10,
=81;
(3)
×
+
÷
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(4)35÷[
×(1-
)],
=35÷[
×
],
=35÷
,
=56;
(5)41×101,
=41×(100+1),
=41×100+41,
=4100+41,
=4141;
(6)5×
×
×
,
=(5×
)×(
×
),
=2×
,
=
;
(7)8.5-(5.6+4.8)÷1.3,
=8.5-10.4÷1.3,
=8.5-8,
=0.5;
(8)12×(
-
+
),
=12×
-12×
+12×
,
=3-4+2,
=1.
(1)
| 11 |
| 9 |
| 2 |
| 9 |
| 7 |
| 13 |
=
| 11 |
| 9 |
| 2 |
| 9 |
| 7 |
| 13 |
=1-
| 7 |
| 13 |
=
| 6 |
| 13 |
(2)91-10÷0.25÷4,
=91-10÷(0.25×4),
=91-10÷1,
=91-10,
=81;
(3)
| 5 |
| 7 |
| 9 |
| 11 |
| 2 |
| 11 |
| 7 |
| 5 |
=
| 5 |
| 7 |
| 9 |
| 11 |
| 2 |
| 11 |
| 5 |
| 7 |
=(
| 9 |
| 11 |
| 2 |
| 11 |
| 5 |
| 7 |
=1×
| 5 |
| 7 |
=
| 5 |
| 7 |
(4)35÷[
| 7 |
| 8 |
| 2 |
| 7 |
=35÷[
| 7 |
| 8 |
| 5 |
| 7 |
=35÷
| 5 |
| 8 |
=56;
(5)41×101,
=41×(100+1),
=41×100+41,
=4100+41,
=4141;
(6)5×
| 1 |
| 3 |
| 2 |
| 5 |
| 3 |
| 10 |
=(5×
| 2 |
| 5 |
| 1 |
| 3 |
| 3 |
| 10 |
=2×
| 1 |
| 10 |
=
| 1 |
| 5 |
(7)8.5-(5.6+4.8)÷1.3,
=8.5-10.4÷1.3,
=8.5-8,
=0.5;
(8)12×(
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 6 |
=12×
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 6 |
=3-4+2,
=1.
点评:考查了运算定律与简便运算,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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