题目内容
脱式计算,能用简便用算的要用简便用算.
| 8×
|
| ||||||||||||||||
[1-(
|
| 37×
| ||||||||||||||||
|
考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)(5)先把除法变为乘法,再根据乘法的分配律简算;
(2)先算乘除,后算加法;
(3)根据乘法的交换律简算;
(4)先算小括号里的,再算中括号里面的,再算中括号外面的;
(6)根据乘法的分配律简算;
(7)先算小括号里的,再算小括号外面的.
(2)先算乘除,后算加法;
(3)根据乘法的交换律简算;
(4)先算小括号里的,再算中括号里面的,再算中括号外面的;
(6)根据乘法的分配律简算;
(7)先算小括号里的,再算小括号外面的.
解答:
解:(1)
+(
-
)÷
=
+(
×2-
×2)
=
+
-
=
-
=
(2)8×
+
÷4
=
+
=6
(3)
×
×9
=
×9×
=2×
=
(4)[1-(
-
)]÷
=[1-
]÷
=
÷
=
(5)
÷
+
×
=(
+
)×
=1×
=
(6)37×
=(36+1)×
=36×
+1×
=5+
=5
(7)
×
÷(
-
)
=
×
÷
=
÷
=
| 15 |
| 16 |
| 7 |
| 16 |
| 1 |
| 4 |
| 1 |
| 2 |
=
| 15 |
| 16 |
| 7 |
| 16 |
| 1 |
| 4 |
=
| 15 |
| 16 |
| 14 |
| 16 |
| 1 |
| 2 |
=
| 29 |
| 16 |
| 8 |
| 16 |
=
| 21 |
| 16 |
(2)8×
| 5 |
| 6 |
| 2 |
| 5 |
=
| 20 |
| 3 |
| 1 |
| 10 |
=6
| 23 |
| 30 |
(3)
| 2 |
| 9 |
| 3 |
| 20 |
=
| 2 |
| 9 |
| 3 |
| 20 |
=2×
| 3 |
| 20 |
=
| 3 |
| 10 |
(4)[1-(
| 3 |
| 4 |
| 3 |
| 5 |
| 7 |
| 10 |
=[1-
| 3 |
| 20 |
| 7 |
| 10 |
=
| 17 |
| 20 |
| 7 |
| 10 |
=
| 17 |
| 14 |
(5)
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 5 |
| 11 |
=1×
| 5 |
| 11 |
=
| 5 |
| 11 |
(6)37×
| 5 |
| 36 |
=(36+1)×
| 5 |
| 36 |
=36×
| 5 |
| 36 |
| 5 |
| 36 |
=5+
| 5 |
| 36 |
=5
| 5 |
| 36 |
(7)
| 1 |
| 6 |
| 2 |
| 3 |
| 4 |
| 5 |
| 8 |
| 15 |
=
| 1 |
| 6 |
| 2 |
| 3 |
| 4 |
| 15 |
=
| 1 |
| 9 |
| 4 |
| 15 |
=
| 5 |
| 12 |
点评:本题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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