题目内容
计算
|
4.375-3
|
46.5×37+4.65×650-93 | ||||||||||||||||||
|
28
|
|
考点:分数的四则混合运算,运算定律与简便运算,小数四则混合运算,分数的拆项
专题:运算顺序及法则,运算定律及简算
分析:(1)根据乘法交换律和结合律进行简算;
(2)根据加法交换律和结合律以及减法的性质进行简算;
(3)根据乘法分配律进行简算;
(4)先算加法,再根据除法的性质进行简算;
(5)根据乘法分配律进行简算;
(6)根据分数的拆项进行简算.
(2)根据加法交换律和结合律以及减法的性质进行简算;
(3)根据乘法分配律进行简算;
(4)先算加法,再根据除法的性质进行简算;
(5)根据乘法分配律进行简算;
(6)根据分数的拆项进行简算.
解答:
解:(1)
×
÷
×
=(
÷
)×(
×
)
=1×
=
;
(2)4.375-3
+2
-1
=(4.375+2
)-(3
+1
)
=7-5
=2;
(3)46.5×37+4.65×650-93
=46.5×37+46.5×65-46.5×2
=46.5×(37+65-2)
=46.5×100
=4650;
(4)
÷[(
+
)×
]
=
÷[
×
]
=
÷
÷
=
÷
÷
=1÷
=
;
(5)28
÷7
=(28+
)×
=28×
+
×
=4+
=4
;
(6)
+
+
+…+
=(1-
)+(
-
)+(
-
)+…+(
-
)
=1-
+
-
+
-
+…+
-
=1-
=
.
| 4 |
| 5 |
| 3 |
| 7 |
| 4 |
| 5 |
| 3 |
| 7 |
=(
| 4 |
| 5 |
| 4 |
| 5 |
| 3 |
| 7 |
| 3 |
| 7 |
=1×
| 9 |
| 49 |
=
| 9 |
| 49 |
(2)4.375-3
| 2 |
| 7 |
| 5 |
| 8 |
| 5 |
| 7 |
=(4.375+2
| 5 |
| 8 |
| 2 |
| 7 |
| 5 |
| 7 |
=7-5
=2;
(3)46.5×37+4.65×650-93
=46.5×37+46.5×65-46.5×2
=46.5×(37+65-2)
=46.5×100
=4650;
(4)
| 7 |
| 8 |
| 1 |
| 4 |
| 1 |
| 5 |
| 7 |
| 8 |
=
| 7 |
| 8 |
| 9 |
| 20 |
| 7 |
| 8 |
=
| 7 |
| 8 |
| 9 |
| 20 |
| 7 |
| 8 |
=
| 7 |
| 8 |
| 7 |
| 8 |
| 9 |
| 20 |
=1÷
| 9 |
| 20 |
=
| 20 |
| 9 |
(5)28
| 7 |
| 10 |
=(28+
| 7 |
| 10 |
| 1 |
| 7 |
=28×
| 1 |
| 7 |
| 7 |
| 10 |
| 1 |
| 7 |
=4+
| 1 |
| 10 |
=4
| 1 |
| 10 |
(6)
| 1 |
| 1×2 |
| 1 |
| 2×3 |
| 1 |
| 3×4 |
| 1 |
| 2010×2011 |
=(1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 2010 |
| 1 |
| 2011 |
=1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 2010 |
| 1 |
| 2011 |
=1-
| 1 |
| 2011 |
=
| 2010 |
| 2011 |
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定律简便计算.
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