题目内容
用递等式计算.
+
+
+
;
×
+
÷
;
+(
-
)÷
;
÷[(
+
)×
].
| 7 |
| 11 |
| 1 |
| 5 |
| 4 |
| 11 |
| 3 |
| 5 |
| 2 |
| 5 |
| 1 |
| 2 |
| 9 |
| 10 |
| 9 |
| 20 |
| 5 |
| 16 |
| 7 |
| 16 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 15 |
| 2 |
| 3 |
| 1 |
| 5 |
| 1 |
| 26 |
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)运用加法交换律和结合律解答,
(2)按照先同时计算乘法和除法,再算加法顺序计算解答,
(3)按照先算括号里面的减法,再算除法,最后算加法顺序计算解答,
(4)按照先算小括号里面的,再算中括号里面的,最后算括号外面的顺序计算解答.
(2)按照先同时计算乘法和除法,再算加法顺序计算解答,
(3)按照先算括号里面的减法,再算除法,最后算加法顺序计算解答,
(4)按照先算小括号里面的,再算中括号里面的,最后算括号外面的顺序计算解答.
解答:
解:(1)
+
+
+
=(
+
)+(
+
)
=1+
=1
;
(2)
×
+
÷
=
+2
=2
;
(3)
+(
-
)÷
=
+
÷
=
+
=
;
(4)
÷[(
+
)×
]
=
÷[
×
]
=
÷
=2.
| 7 |
| 11 |
| 1 |
| 5 |
| 4 |
| 11 |
| 3 |
| 5 |
=(
| 7 |
| 11 |
| 4 |
| 11 |
| 1 |
| 5 |
| 3 |
| 5 |
=1+
| 4 |
| 5 |
=1
| 4 |
| 5 |
(2)
| 2 |
| 5 |
| 1 |
| 2 |
| 9 |
| 10 |
| 9 |
| 20 |
=
| 1 |
| 5 |
=2
| 1 |
| 5 |
(3)
| 5 |
| 16 |
| 7 |
| 16 |
| 1 |
| 4 |
| 1 |
| 2 |
=
| 5 |
| 16 |
| 3 |
| 16 |
| 1 |
| 2 |
=
| 5 |
| 16 |
| 3 |
| 8 |
=
| 11 |
| 16 |
(4)
| 1 |
| 15 |
| 2 |
| 3 |
| 1 |
| 5 |
| 1 |
| 26 |
=
| 1 |
| 15 |
| 13 |
| 15 |
| 1 |
| 26 |
=
| 1 |
| 15 |
| 1 |
| 30 |
=2.
点评:(1)依据四则运算计算方法正确进行计算,(2)正确运用简便方法解决问题,是本题考查知识点.
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