题目内容
计算,能简算的要简算.
(24+
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考点:分数的四则混合运算
专题:运算顺序及法则
分析:(1)把除法变为乘法,运用乘法分配律简算.
(2)先算括号内的除法,再算括号外的除法.
(3)通过数字转化,运用乘法分配律简算.
(4)先算括号内的减法,再算括号外的除法,最后算加法.
(5)先算括号内的减法,再算括号外的加法.
(6)先算除法,再算加法.
(2)先算括号内的除法,再算括号外的除法.
(3)通过数字转化,运用乘法分配律简算.
(4)先算括号内的减法,再算括号外的除法,最后算加法.
(5)先算括号内的减法,再算括号外的加法.
(6)先算除法,再算加法.
解答:
解:(1)(24+
)÷12
=(24+
)×
=24×
+
×
=2+
=2
(2)
÷(
÷
)
=
÷(
×
)
=
÷
=
×
=
(3)
×
+75%×
=
×
+
×
=(
+
)×
=1×
=
(4)
+(
-
)÷
=
+
×6
=
+
=
(5)
+(
-
)
=(
+
)-
=1-
=
(6)
+
÷
=
+
×4
=
+
=
| 6 |
| 13 |
=(24+
| 6 |
| 13 |
| 1 |
| 12 |
=24×
| 1 |
| 12 |
| 6 |
| 13 |
| 1 |
| 12 |
=2+
| 1 |
| 26 |
=2
| 1 |
| 26 |
(2)
| 3 |
| 8 |
| 2 |
| 3 |
| 4 |
| 15 |
=
| 3 |
| 8 |
| 2 |
| 3 |
| 15 |
| 4 |
=
| 3 |
| 8 |
| 5 |
| 2 |
=
| 3 |
| 8 |
| 2 |
| 5 |
=
| 3 |
| 20 |
(3)
| 4 |
| 5 |
| 3 |
| 4 |
| 1 |
| 5 |
=
| 4 |
| 5 |
| 3 |
| 4 |
| 3 |
| 4 |
| 1 |
| 5 |
=(
| 4 |
| 5 |
| 1 |
| 5 |
| 3 |
| 4 |
=1×
| 3 |
| 4 |
=
| 3 |
| 4 |
(4)
| 11 |
| 15 |
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 6 |
=
| 11 |
| 15 |
| 1 |
| 12 |
=
| 11 |
| 15 |
| 1 |
| 2 |
=
| 37 |
| 30 |
(5)
| 7 |
| 15 |
| 8 |
| 15 |
| 2 |
| 7 |
=(
| 7 |
| 15 |
| 8 |
| 15 |
| 2 |
| 7 |
=1-
| 2 |
| 7 |
=
| 5 |
| 7 |
(6)
| 2 |
| 3 |
| 4 |
| 15 |
| 1 |
| 4 |
=
| 2 |
| 3 |
| 4 |
| 15 |
=
| 2 |
| 3 |
| 16 |
| 15 |
=
| 46 |
| 15 |
点评: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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