题目内容
(2005?龙湖区)脱式计算.(能简算的要简算)
1840-725÷25×16
-
-
16.4+3.5+83.6+166.5
(
+
)×
-
59+59×13+14×41
36÷[(
-
)×3].
1840-725÷25×16
| 27 |
| 8 |
| 8 |
| 17 |
| 9 |
| 17 |
16.4+3.5+83.6+166.5
(
| 8 |
| 9 |
| 4 |
| 3 |
| 3 |
| 4 |
| 1 |
| 4 |
59+59×13+14×41
36÷[(
| 5 |
| 6 |
| 1 |
| 3 |
分析:(1)1840-725÷25×16,再计算1840-29×16时,把29看作30-1,计算起来较简便;
(2)
-
-
,运用减法的性质简算,同时注意运算符号的变化;
(3)16.4+3.5+83.6+166.5,运用加法交换律和结合律简算;
(4)(
+
)×
-
,在计算(
+
)×
时,运用乘法分配律简算;
(5)59+59×13+14×41,此题运用乘法分配律的逆运算简算;
(6)36÷[(
-
)×3],先算(
-
)×3,运用乘法分配律简算,然后算括号外的.
(2)
| 27 |
| 8 |
| 8 |
| 17 |
| 9 |
| 17 |
(3)16.4+3.5+83.6+166.5,运用加法交换律和结合律简算;
(4)(
| 8 |
| 9 |
| 4 |
| 3 |
| 3 |
| 4 |
| 1 |
| 4 |
| 8 |
| 9 |
| 4 |
| 3 |
| 3 |
| 4 |
(5)59+59×13+14×41,此题运用乘法分配律的逆运算简算;
(6)36÷[(
| 5 |
| 6 |
| 1 |
| 3 |
| 5 |
| 6 |
| 1 |
| 3 |
解答:解:(1)1840-725÷25×16,
=1840-29×16,
=1840-(30-1)×16,
=1840-30×16+16,
=1360+16,
=1376;
(2)
-
-
,
=
-(
+
),
=
-1,
=
,
=2
;
(3)16.4+3.5+83.6+166.5,
=(16.4+83.6)+(3.5+166.5),
=100+170,
=270;
(4)(
+
)×
-
,
=
×
+
×
-
,
=
+1-
,
=
-
+1,
=
+1,
=1
;
(5)59+59×13+14×41,
=(1+13)×59+14×41,
=14×59+14×41,
=(59+41)×14,
=100×14,
=1400;
(6)36÷[(
-
)×3],
=36÷[
×3-
×3],
=36÷
,
=36×
,
=24.
=1840-29×16,
=1840-(30-1)×16,
=1840-30×16+16,
=1360+16,
=1376;
(2)
| 27 |
| 8 |
| 8 |
| 17 |
| 9 |
| 17 |
=
| 27 |
| 8 |
| 8 |
| 17 |
| 9 |
| 17 |
=
| 27 |
| 8 |
=
| 19 |
| 8 |
=2
| 3 |
| 8 |
(3)16.4+3.5+83.6+166.5,
=(16.4+83.6)+(3.5+166.5),
=100+170,
=270;
(4)(
| 8 |
| 9 |
| 4 |
| 3 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 8 |
| 9 |
| 3 |
| 4 |
| 4 |
| 3 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 2 |
| 3 |
| 1 |
| 4 |
=
| 2 |
| 3 |
| 1 |
| 4 |
=
| 5 |
| 12 |
=1
| 5 |
| 12 |
(5)59+59×13+14×41,
=(1+13)×59+14×41,
=14×59+14×41,
=(59+41)×14,
=100×14,
=1400;
(6)36÷[(
| 5 |
| 6 |
| 1 |
| 3 |
=36÷[
| 5 |
| 6 |
| 1 |
| 3 |
=36÷
| 3 |
| 2 |
=36×
| 2 |
| 3 |
=24.
点评:此题考查学生对四则混合运算顺序的掌握情况,以及对运算定律的灵活运用能力.
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