题目内容
(2011?泉州)
用你自己喜欢的方法计算: ①6760÷13+17×25 |
②4.35×6.8+56.5×0.68 | ||||||||
③
|
④346÷34.6%-346. |
分析:①同时运算除法和乘法,再算加法;
②先根据积不变规律,把56.5×0.68化为5.65×6.8,再运用乘法分配律简算;
③先算小括号里面的减法,再算括号外的除法,最后算乘法;
④先算除法,再算减法.
②先根据积不变规律,把56.5×0.68化为5.65×6.8,再运用乘法分配律简算;
③先算小括号里面的减法,再算括号外的除法,最后算乘法;
④先算除法,再算减法.
解答:解:①6760÷13+17×25,
=520+425,
=945;
②4.35×6.8+56.5×0.68,
=4.35×6.8+5.65×6.8,
=(4.35+5.65)×6.8,
=10×6.8,
=68;
③
÷(
-
)×
,
=
÷
×
,
=
×
,
=
;
④346÷34.6%-346,
=1000-346,
=654.
=520+425,
=945;
②4.35×6.8+56.5×0.68,
=4.35×6.8+5.65×6.8,
=(4.35+5.65)×6.8,
=10×6.8,
=68;
③
4 |
9 |
5 |
6 |
1 |
2 |
7 |
8 |
=
4 |
9 |
1 |
3 |
7 |
8 |
=
4 |
3 |
7 |
8 |
=
7 |
6 |
④346÷34.6%-346,
=1000-346,
=654.
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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