题目内容
计算,写出主要过程
[1
+(6
-3.75)×2
]÷3
16
×42-164
×2.9+16.48×37
51
×
+71
×
+91
×
(1+
+…+
)×(
+
+…+
)-(1+
+…+
)×(
+
+…+
).
[1
| 1 |
| 4 |
| 2 |
| 3 |
| 2 |
| 7 |
| 3 |
| 4 |
16
| 12 |
| 25 |
| 4 |
| 5 |
51
| 2 |
| 3 |
| 3 |
| 5 |
| 3 |
| 4 |
| 4 |
| 7 |
| 4 |
| 5 |
| 5 |
| 9 |
(1+
| 1 |
| 2 |
| 1 |
| 2007 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2008 |
| 1 |
| 2 |
| 1 |
| 2008 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2007 |
考点:整数、分数、小数、百分数四则混合运算,分数的巧算
专题:运算顺序及法则
分析:(1)先算小括号里面的,再算中括号里面的,最后算括号外面的.
(2)利用乘法的分配律进行解答.
(3)先算乘法,再算加法.
(4)利用乘法的分配律解答.
(2)利用乘法的分配律进行解答.
(3)先算乘法,再算加法.
(4)利用乘法的分配律解答.
解答:
解:[1
+(6
-3.75)×2
]÷3
=[1
+2
×2
]÷3
=[1
+
]÷3
=
÷3
=
16
×42-164
×2.9+16.48×37
=16.48×(42+37-29)
=16.48×50
=8.24×(2×50)
=824
51
×
+71
×
+91
×
=
×
+
×
+
×
=31+41+51
=123
(1+
+…+
)×(
+
+…+
)-(1+
+…+
)×(
+
+…+
)
=(
+
+…+
)+(1+
+…+
)×(
+
+…+
)-(1+
+…+
)×(
+
+…+
)-(
+
+…+
)
=(
+
+…+
)-(
+
+…+
)
=
+
+…+
-
-
-…-
=
| 1 |
| 4 |
| 2 |
| 3 |
| 2 |
| 7 |
| 3 |
| 4 |
=[1
| 1 |
| 4 |
| 11 |
| 12 |
| 2 |
| 7 |
| 3 |
| 4 |
=[1
| 1 |
| 4 |
| 20 |
| 3 |
| 3 |
| 4 |
=
| 95 |
| 12 |
| 3 |
| 4 |
=
| 19 |
| 9 |
16
| 12 |
| 25 |
| 4 |
| 5 |
=16.48×(42+37-29)
=16.48×50
=8.24×(2×50)
=824
51
| 2 |
| 3 |
| 3 |
| 5 |
| 3 |
| 4 |
| 4 |
| 7 |
| 4 |
| 5 |
| 5 |
| 9 |
=
| 155 |
| 3 |
| 3 |
| 5 |
| 287 |
| 4 |
| 4 |
| 7 |
| 459 |
| 5 |
| 5 |
| 9 |
=31+41+51
=123
(1+
| 1 |
| 2 |
| 1 |
| 2007 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2008 |
| 1 |
| 2 |
| 1 |
| 2008 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2007 |
=(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2008 |
| 1 |
| 2 |
| 1 |
| 2008 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2007 |
| 1 |
| 2 |
| 1 |
| 2008 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2007 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2007 |
=(
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2008 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2007 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2008 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2007 |
=
| 1 |
| 2008 |
点评:此题考查了有括号的分数四则混合运算的顺序和整数的运算顺序相同以及简便算法的应用.
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