题目内容
计算:
(1)
÷(
+
)
(2)
×
+
÷6
(3)
÷
×
(4)(
-
×
)÷
.
(1)
| 3 |
| 8 |
| 3 |
| 4 |
| 3 |
| 8 |
(2)
| 7 |
| 10 |
| 5 |
| 6 |
| 7 |
| 10 |
(3)
| 1 |
| 3 |
| 5 |
| 6 |
| 15 |
| 16 |
(4)(
| 5 |
| 6 |
| 5 |
| 6 |
| 3 |
| 4 |
| 7 |
| 12 |
考点:运算定律与简便运算,分数的简便计算,分数的四则混合运算
专题:运算顺序及法则
分析:(1)先算小括号里的加法,再算括号外的除法;
(2)把除以6化成乘以
,再运用乘法的分配律进行简算;
(3)把除法化成乘法,再从左向右进行计算即可;
(4)先算小括号里的乘法,再算小括号里的减法,最后算括号外的除法.
(2)把除以6化成乘以
| 1 |
| 6 |
(3)把除法化成乘法,再从左向右进行计算即可;
(4)先算小括号里的乘法,再算小括号里的减法,最后算括号外的除法.
解答:
解:(1)
÷(
+
)
=
÷
=
;
(2)
×
+
÷6
=
×
+
×
=
×(
+
)
=
×1
=
;
(3)
÷
×
=
×
×
=
=
;
(4)(
-
×
)÷
=(
-
)÷
=
÷
=
.
| 3 |
| 8 |
| 3 |
| 4 |
| 3 |
| 8 |
=
| 3 |
| 8 |
| 9 |
| 8 |
=
| 1 |
| 3 |
(2)
| 7 |
| 10 |
| 5 |
| 6 |
| 7 |
| 10 |
=
| 7 |
| 10 |
| 5 |
| 6 |
| 7 |
| 10 |
| 1 |
| 6 |
=
| 7 |
| 10 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 7 |
| 10 |
=
| 7 |
| 10 |
(3)
| 1 |
| 3 |
| 5 |
| 6 |
| 15 |
| 16 |
=
| 1 |
| 3 |
| 6 |
| 5 |
| 15 |
| 16 |
=
| 1×6×15 |
| 3×5×16 |
=
| 3 |
| 8 |
(4)(
| 5 |
| 6 |
| 5 |
| 6 |
| 3 |
| 4 |
| 7 |
| 12 |
=(
| 5 |
| 6 |
| 5 |
| 8 |
| 7 |
| 12 |
=
| 5 |
| 24 |
| 7 |
| 12 |
=
| 5 |
| 14 |
点评:此题主要考查分数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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