题目内容
| 计算下面各题,怎样简便怎样算. 8×35-2448÷24 | 3-
| ||||||||||||||||
| (0.63-0.63÷3)×0.5 | 3.64÷4+4.36×0.25 | ||||||||||||||||
|
|
考点:分数的四则混合运算,整数四则混合运算,小数四则混合运算
专题:运算顺序及法则
分析:(1)先算乘法和除法,再算减法;
(2)先算乘法,再根据减法的性质进行简算;
(3)先算除法,再算减法,最后算乘法;
(4)根据乘法分配律进行简算;
(5)先算减法,再算中括号里面的除法,最后算括号外面的除法;
(6)原式先加上
,再减去
,然后再根据加法结合律进行简算.
(2)先算乘法,再根据减法的性质进行简算;
(3)先算除法,再算减法,最后算乘法;
(4)根据乘法分配律进行简算;
(5)先算减法,再算中括号里面的除法,最后算括号外面的除法;
(6)原式先加上
| 1 |
| 16 |
| 1 |
| 16 |
解答:
解:(1)8×35-2448÷24
=280-102
=178;
(2)3-
×
-
=3-
-
=3-(
+
)
=3-1
=2;
(3)(0.63-0.63÷3)×0.5
=(0.63-0.21)×0.5
=0.42×0.5
=0.21;
(4)3.64÷4+4.36×0.25
=3.64×0.25+4.36×0.25
=(3.64+4.36)×0.25
=8×0.25
=2;
(5)
÷[
÷(
-
)]
=
÷[
÷
]
=
÷
=
;
(6)
+
+
+
=
+
+
+
+
-
=
+
+
+(
+
)-
=
+
+
+
-
=
+
+(
+
)-
=
+
+
-
=
+(
+
)-
=
+
-
=1-
=
.
=280-102
=178;
(2)3-
| 5 |
| 18 |
| 27 |
| 40 |
| 13 |
| 16 |
=3-
| 3 |
| 16 |
| 13 |
| 16 |
=3-(
| 3 |
| 16 |
| 13 |
| 16 |
=3-1
=2;
(3)(0.63-0.63÷3)×0.5
=(0.63-0.21)×0.5
=0.42×0.5
=0.21;
(4)3.64÷4+4.36×0.25
=3.64×0.25+4.36×0.25
=(3.64+4.36)×0.25
=8×0.25
=2;
(5)
| 3 |
| 22 |
| 5 |
| 4 |
| 14 |
| 3 |
| 1 |
| 2 |
=
| 3 |
| 22 |
| 5 |
| 4 |
| 25 |
| 6 |
=
| 3 |
| 22 |
| 3 |
| 10 |
=
| 5 |
| 11 |
(6)
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
=
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 16 |
| 1 |
| 16 |
=
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 16 |
| 1 |
| 16 |
| 1 |
| 16 |
=
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 16 |
=
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 16 |
=
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 16 |
=
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 16 |
=
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 16 |
=1-
| 1 |
| 16 |
=
| 15 |
| 16 |
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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