题目内容
怎样算简便就怎样算.
×
+
÷6
×
÷(
-
)
(
+
)×24
+(
-
)÷
.
| 1 |
| 6 |
| 7 |
| 10 |
| 3 |
| 10 |
| 1 |
| 3 |
| 3 |
| 4 |
| 3 |
| 4 |
| 5 |
| 12 |
(
| 2 |
| 3 |
| 1 |
| 6 |
| 15 |
| 16 |
| 7 |
| 16 |
| 1 |
| 4 |
| 1 |
| 2 |
考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则,运算定律及简算
分析:(1)把除法变为乘法,运用乘法分配律简算.
(2)先算乘法和括号内的,再算括号外的.
(3)运用乘法分配律简算.
(4)先算括号内的,再算括号外的除法,最后算加法.
(2)先算乘法和括号内的,再算括号外的.
(3)运用乘法分配律简算.
(4)先算括号内的,再算括号外的除法,最后算加法.
解答:
解:(1)
×
+
÷6
=
×
+
×
=
×(
+
)
=
×1
=
(2)
×
÷(
-
)
=
÷
=
×3
=
(3)(
+
)×24
=
×24
=20
(4)
+(
-
)÷
=
+
÷
=
+
×2
=
+
=
| 1 |
| 6 |
| 7 |
| 10 |
| 3 |
| 10 |
=
| 1 |
| 6 |
| 7 |
| 10 |
| 3 |
| 10 |
| 1 |
| 6 |
=
| 1 |
| 6 |
| 7 |
| 10 |
| 3 |
| 10 |
=
| 1 |
| 6 |
=
| 1 |
| 6 |
(2)
| 1 |
| 3 |
| 3 |
| 4 |
| 3 |
| 4 |
| 5 |
| 12 |
=
| 1 |
| 4 |
| 1 |
| 3 |
=
| 1 |
| 4 |
=
| 3 |
| 4 |
(3)(
| 2 |
| 3 |
| 1 |
| 6 |
=
| 5 |
| 6 |
=20
(4)
| 15 |
| 16 |
| 7 |
| 16 |
| 1 |
| 4 |
| 1 |
| 2 |
=
| 15 |
| 16 |
| 3 |
| 16 |
| 1 |
| 2 |
=
| 15 |
| 16 |
| 3 |
| 16 |
=
| 15 |
| 16 |
| 6 |
| 16 |
=
| 21 |
| 16 |
点评:此题考查了分数的四则混合运算,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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