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. |
(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.
=(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.