作业帮 > 综合 > 作业

用简便方法算下面各题.

来源:学生作业帮 编辑:搜狗做题网作业帮 分类:综合作业 时间:2024/07/15 19:50:13
用简便方法算下面各题.

4.8+25.36+17.2+14.64  
(400-2)×25 125×27×8
34×23+77×34 41.2-1.47-9.53  37×99.
用简便方法算下面各题.
(1)4.8+25.36+17.2+14.64,
=(4.8+17.2)+(25.36+14.64),
=22+40,
=62;

(2)(400-2)×25,
=400×25-2×25,
=10000-50,
=9950;

(3)125×27×8,
=(125×8)×27,
=1000×27,
=27000;

(4)34×23+77×34,
=34×(23+77),
=34×100,
=3400;

(5)41.2-1.47-9.53,
=41.2-(1.47+9.53),
=41.2-11,
=30.2;

(6)37×99,
=37×(100-1),
=37×100-37,
=3700-37,
=3663.