题目内容
(2012?宝应县模拟)脱式计算
(1)
+(1-
)×
(2)
÷
×14
(3)5-5×
+
.
(1)
8 |
9 |
3 |
4 |
4 |
9 |
(2)
4 |
5 |
7 |
10 |
(3)5-5×
2 |
5 |
3 |
5 |
分析:算式(1)(2)根据四则混合运算的运算顺序计算即可:先算乘除,再算加减,有括号的要先算括号里面的.
算式(3)可根据乘法分配律进行计算.
算式(3)可根据乘法分配律进行计算.
解答:解:(1)
+(1-
)×
=
+
×
,
=
+
,
=1;
(2)
÷
×14
=
×
×14,
=16;
(3)5-5×
+
=(1-
)×5+
,
=
×5+
,
=3+
,
=3
.
8 |
9 |
3 |
4 |
4 |
9 |
=
8 |
9 |
1 |
4 |
4 |
9 |
=
8 |
9 |
1 |
9 |
=1;
(2)
4 |
5 |
7 |
10 |
=
4 |
5 |
10 |
7 |
=16;
(3)5-5×
2 |
5 |
3 |
5 |
=(1-
2 |
5 |
3 |
5 |
=
3 |
5 |
3 |
5 |
=3+
3 |
5 |
=3
3 |
5 |
点评:在完成脱式计算题目时,要注意计算过程的完整性,中间不要有太大的跳跃.
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