题目内容
怎样简便就怎样算.
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10÷
|
分析:(1)先算乘法,再算加法;
(2)先算小括号里面的加法,再算括号外的除法;
(3)运用乘法分配律简算;
(4)按照从左到右的顺序计算.
(2)先算小括号里面的加法,再算括号外的除法;
(3)运用乘法分配律简算;
(4)按照从左到右的顺序计算.
解答:解:(1)
+
×
,
=
+
,
=
;
(2)
÷(
+
),
=
÷
,
=
;
(3)
×9+
,
=
×(9+1),
=
×10,
=7;
(4)10÷
÷
,
=25÷
,
=125.
1 |
7 |
6 |
7 |
1 |
5 |
=
1 |
7 |
6 |
35 |
=
11 |
35 |
(2)
5 |
16 |
5 |
8 |
1 |
16 |
=
5 |
16 |
11 |
16 |
=
5 |
11 |
(3)
7 |
10 |
7 |
10 |
=
7 |
10 |
=
7 |
10 |
=7;
(4)10÷
2 |
5 |
1 |
5 |
=25÷
1 |
5 |
=125.
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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