题目内容
23×0.75+27×
|
2-2÷3 |
| ||||||||||
6
|
1.25×0.25×32 | 8.5-
| ||||||||||
2011×
|
12.7×99+12.7 |
| ||||||||||
| 87×101 | 1200-197. |
分析:(1)23×0.75+27×
+50×75%,把分数、百分数化成小数,再运用乘法分配律进行简算.
(2)2-2÷3,按照运算顺序直接进行简算;
(3)
÷(
+
),根据分数四则混合运算的顺序,按照分数四则运算的计算法则进行计算;
(4)6
-(2
-
),根据减法的运算性质进行简算;
(5)1.25×0.25×32,把32 分解为8×4,再运用乘法交换律和结合律进行简算;
(6)8.5-
÷
,根据混合运算的运算顺序,按照法则进行计算;
(7)2011×
,转化为:(2010+1)×
,再运用乘法分配律进行简算;
(8)12.7×99+12.7,运用乘法分配律进行简算;
(9)
×〔
-(
-
)〕,根据分数四则混合运算的顺序,按照分数四则运算的计算法则进行计算;
(10)87×101,运用乘法分配律进行简算;
(11)1200-197,根据减法的运算性质进行简算;
| 3 |
| 4 |
(2)2-2÷3,按照运算顺序直接进行简算;
(3)
| 5 |
| 6 |
| 1 |
| 2 |
| 5 |
| 6 |
(4)6
| 7 |
| 16 |
| 7 |
| 16 |
| 7 |
| 11 |
(5)1.25×0.25×32,把32 分解为8×4,再运用乘法交换律和结合律进行简算;
(6)8.5-
| 2 |
| 3 |
| 2 |
| 15 |
(7)2011×
| 2009 |
| 2010 |
| 2009 |
| 2010 |
(8)12.7×99+12.7,运用乘法分配律进行简算;
(9)
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
(10)87×101,运用乘法分配律进行简算;
(11)1200-197,根据减法的运算性质进行简算;
解答:解:(1)23×0.75+27×
+50×75%,
=(23+27+50)×0.75,
=100×0.75,
=75.
(2)2-2÷3,
=2-
,
=1
;
(3)
÷(
+
),
=
÷
,
=
×
,
=
;
(4)6
-(2
-
),
=6
-2
+
,
=4+
,
=4
;
(5)1.25×0.25×32,
=(1.25×8)×(0.25×4),
=10×1,
=10;
(6)8.5-
÷
,
=8.5-
×
,
=8.5-5,
=3.5;
(7)2011×
,
=(2010+1)×
,
=2010×
+
,
=2009+
,
=2009
;
(8)12.7×99+12.7,
=12.7×(99+1),
=12.7×100,
=1270;
(9)
×〔
-(
-
)〕,
=
×[
-
],
=
×
,
=
;
(10)87×101,
=87×100+87,
=8700+87,
=8787;
(11)1200-197,
=1200-200+3,
=1003.
| 3 |
| 4 |
=(23+27+50)×0.75,
=100×0.75,
=75.
(2)2-2÷3,
=2-
| 2 |
| 3 |
=1
| 1 |
| 3 |
(3)
| 5 |
| 6 |
| 1 |
| 2 |
| 5 |
| 6 |
=
| 5 |
| 6 |
| 8 |
| 6 |
=
| 5 |
| 6 |
| 6 |
| 8 |
=
| 5 |
| 8 |
(4)6
| 7 |
| 16 |
| 7 |
| 16 |
| 7 |
| 11 |
=6
| 7 |
| 16 |
| 7 |
| 16 |
| 7 |
| 11 |
=4+
| 7 |
| 11 |
=4
| 7 |
| 11 |
(5)1.25×0.25×32,
=(1.25×8)×(0.25×4),
=10×1,
=10;
(6)8.5-
| 2 |
| 3 |
| 2 |
| 15 |
=8.5-
| 2 |
| 3 |
| 15 |
| 2 |
=8.5-5,
=3.5;
(7)2011×
| 2009 |
| 2010 |
=(2010+1)×
| 2009 |
| 2010 |
=2010×
| 2009 |
| 2010 |
| 2009 |
| 2010 |
=2009+
| 2009 |
| 2010 |
=2009
| 2009 |
| 2010 |
(8)12.7×99+12.7,
=12.7×(99+1),
=12.7×100,
=1270;
(9)
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 8 |
| 9 |
| 3 |
| 4 |
| 3 |
| 16 |
=
| 8 |
| 9 |
| 9 |
| 16 |
=
| 1 |
| 2 |
(10)87×101,
=87×100+87,
=8700+87,
=8787;
(11)1200-197,
=1200-200+3,
=1003.
点评:此题主要考查整数、小数、分数四则混合运算,注意运算顺序和计算法则,灵活选择简便方法进行计算.
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