题目内容
计算(能简算的要简算)
|
4÷
|
(
| ||||||||||||||||||
[1-(
|
8.35-1
|
(
|
考点:分数的四则混合运算,运算定律与简便运算
专题:运算顺序及法则,运算定律及简算
分析:(1)根据乘法分配律进行简算;
(2)先算除法,再算减法;
(3)先算减法和加法,再算乘法;
(4)先算加法,再算减法,最后算除法;
(5)根据加法交换律和结合律进行简算;
(6)先算乘法,再算减法,最后算除法.
(2)先算除法,再算减法;
(3)先算减法和加法,再算乘法;
(4)先算加法,再算减法,最后算除法;
(5)根据加法交换律和结合律进行简算;
(6)先算乘法,再算减法,最后算除法.
解答:
解:(1)
÷3+
×
=
×
+
×
=(
+
)×
=1×
=
;
(2)4÷
-
÷4
=5-
=4
;
(3)(
-
)×(
+
)
=
×
=
;
(4)[1-(
+
)]÷
=[1-
]÷
=
÷
=
;
(5)8.35-1
+1.65-
=(8.35+1.65)-(1
+
)
=10-2
=8;
(6)(
-3×
)÷(2-
)
=(
-
)÷(2-
)
=
÷
=
.
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 3 |
=
| 1 |
| 5 |
| 1 |
| 3 |
| 4 |
| 5 |
| 1 |
| 3 |
=(
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 3 |
=1×
| 1 |
| 3 |
=
| 1 |
| 3 |
(2)4÷
| 4 |
| 5 |
| 4 |
| 5 |
=5-
| 1 |
| 5 |
=4
| 4 |
| 5 |
(3)(
| 7 |
| 8 |
| 5 |
| 16 |
| 5 |
| 9 |
| 2 |
| 3 |
=
| 9 |
| 16 |
| 11 |
| 9 |
=
| 11 |
| 16 |
(4)[1-(
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 4 |
=[1-
| 5 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 8 |
| 1 |
| 4 |
=
| 3 |
| 2 |
(5)8.35-1
| 2 |
| 5 |
| 3 |
| 5 |
=(8.35+1.65)-(1
| 2 |
| 5 |
| 3 |
| 5 |
=10-2
=8;
(6)(
| 11 |
| 12 |
| 1 |
| 4 |
| 1 |
| 6 |
=(
| 11 |
| 12 |
| 3 |
| 4 |
| 1 |
| 6 |
=
| 1 |
| 6 |
| 11 |
| 6 |
=
| 1 |
| 11 |
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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