题目内容
脱式计算(能简算的要简算)
(
-
)×
×
+
÷4
35÷
×1-
+
-
+
.
(
| 3 |
| 5 |
| 1 |
| 4 |
| 4 |
| 7 |
| 3 |
| 4 |
| 6 |
| 7 |
| 6 |
| 7 |
35÷
| 7 |
| 8 |
| 2 |
| 7 |
| 7 |
| 9 |
| 3 |
| 5 |
| 3 |
| 5 |
| 7 |
| 9 |
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)先算括号内的,再算括号外的.
(2)把除法变为乘法,运用乘法分配律简算.
(3)先算除法和乘法,再算减法.
(4)运用加法交换律与结合律简算.
(2)把除法变为乘法,运用乘法分配律简算.
(3)先算除法和乘法,再算减法.
(4)运用加法交换律与结合律简算.
解答:
解:(1)(
-
)×
=
×
=
(2)
×
+
÷4
=
×
+
×
=(
+
)×
=1×
=
(3)35÷
×1-
=35×
×1-
=40-
=39
(4)
+
-
+
=(
+
)+(
-
)
=
| 3 |
| 5 |
| 1 |
| 4 |
| 4 |
| 7 |
=
| 7 |
| 20 |
| 4 |
| 7 |
=
| 1 |
| 5 |
(2)
| 3 |
| 4 |
| 6 |
| 7 |
| 6 |
| 7 |
=
| 3 |
| 4 |
| 6 |
| 7 |
| 6 |
| 7 |
| 1 |
| 4 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
| 6 |
| 7 |
=1×
| 6 |
| 7 |
=
| 6 |
| 7 |
(3)35÷
| 7 |
| 8 |
| 2 |
| 7 |
=35×
| 8 |
| 7 |
| 2 |
| 7 |
=40-
| 2 |
| 7 |
=39
| 5 |
| 7 |
(4)
| 7 |
| 9 |
| 3 |
| 5 |
| 3 |
| 5 |
| 7 |
| 9 |
=(
| 7 |
| 9 |
| 7 |
| 9 |
| 3 |
| 5 |
| 3 |
| 5 |
=
| 14 |
| 9 |
点评:完成此题,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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