题目内容
递等式计算.
(99+
)÷9
÷
+
÷
÷[(
+
)×
]
+
÷
.
(99+
9 |
10 |
3 |
7 |
7 |
11 |
4 |
7 |
7 |
11 |
14 |
15 |
4 |
5 |
2 |
3 |
10 |
11 |
5 |
9 |
5 |
9 |
5 |
3 |
分析:(1)(2)先把除法变成乘法,再运用乘法分配律简算;
(3)先算小括号里面的加法,再算中括号里面的乘法,最后算括号外的除法;
(4)先算除法,再算加法.
(3)先算小括号里面的加法,再算中括号里面的乘法,最后算括号外的除法;
(4)先算除法,再算加法.
解答:解:(1)(99+
)÷9,
=(99+
)×
,
=99×
+
×
,
=11+
,
=11
;
(2)
÷
+
÷
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)
÷[(
+
)×
],
=
÷[
×
],
=
÷
,
=
;
(4)
+
÷
,
=
+
,
=
.
9 |
10 |
=(99+
9 |
10 |
1 |
9 |
=99×
1 |
9 |
9 |
10 |
1 |
9 |
=11+
1 |
10 |
=11
1 |
10 |
(2)
3 |
7 |
7 |
11 |
4 |
7 |
7 |
11 |
=
3 |
7 |
11 |
7 |
4 |
7 |
11 |
7 |
=(
3 |
7 |
4 |
7 |
11 |
7 |
=1×
11 |
7 |
=
11 |
7 |
(3)
14 |
15 |
4 |
5 |
2 |
3 |
10 |
11 |
=
14 |
15 |
22 |
15 |
10 |
11 |
=
14 |
15 |
20 |
15 |
=
7 |
10 |
(4)
5 |
9 |
5 |
9 |
5 |
3 |
=
5 |
9 |
3 |
9 |
=
8 |
9 |
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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