题目内容
| 能简算的要简算. 4÷
|
| ||||||||||||||
(
|
|
分析:(1)先把除法变成乘法,再运用乘法分配律简算;
(2)先算小括号里面的加法,再算中括号里面的乘法,最后算括号外的除法;
(3)先同时计算两个小括号里面的加减法,再算括号外的除法;
(4)先算小括号里面的加法,再算括号外的除法.
(2)先算小括号里面的加法,再算中括号里面的乘法,最后算括号外的除法;
(3)先同时计算两个小括号里面的加减法,再算括号外的除法;
(4)先算小括号里面的加法,再算括号外的除法.
解答:解:(1)4÷
+6×
=4×
+6×
=(4+6)×
=10×
=6;
(2)
÷[(
+
)×
]
=
÷[
×
]
=
÷
=
;
(3)(
+
)÷(
-
)
=
÷
=
;
(4)
÷(
+
)
=
÷
=
.
| 5 |
| 3 |
| 3 |
| 5 |
=4×
| 3 |
| 5 |
| 3 |
| 5 |
=(4+6)×
| 3 |
| 5 |
=10×
| 3 |
| 5 |
=6;
(2)
| 7 |
| 15 |
| 1 |
| 2 |
| 1 |
| 6 |
| 3 |
| 4 |
=
| 7 |
| 15 |
| 2 |
| 3 |
| 3 |
| 4 |
=
| 7 |
| 15 |
| 1 |
| 2 |
=
| 14 |
| 15 |
(3)(
| 2 |
| 3 |
| 3 |
| 7 |
| 2 |
| 3 |
| 3 |
| 7 |
=
| 23 |
| 21 |
| 5 |
| 21 |
=
| 23 |
| 5 |
(4)
| 2 |
| 3 |
| 6 |
| 7 |
| 6 |
| 7 |
=
| 2 |
| 3 |
| 12 |
| 7 |
=
| 7 |
| 18 |
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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