简便计算(要求写出简算过程).
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/07/08 01:07:50
简便计算(要求写出简算过程).
73÷36+105÷36+146÷36 | 11+12+13+14+15+16+17+18+19 |
25×125×8×4 | 154-283+246-117. |
(1)73÷36+105÷36+146÷36,
=(73+105+146)÷36,
=324÷36,
=9;
(2)11+12+13+14+15+16+17+18+19,
=(11+19)+(12+18)+(13+17)+(14+16)+15,
=30+30+30+30+15,
=30×4+15,
=120+15,
=135;
(3)25×125×8×4,
=(25×4)×(125×8),
=100×1000,
=100000;
(4)154-283+246-117,
=(154+246)-(283+117),
=400-400,
=0.
=(73+105+146)÷36,
=324÷36,
=9;
(2)11+12+13+14+15+16+17+18+19,
=(11+19)+(12+18)+(13+17)+(14+16)+15,
=30+30+30+30+15,
=30×4+15,
=120+15,
=135;
(3)25×125×8×4,
=(25×4)×(125×8),
=100×1000,
=100000;
(4)154-283+246-117,
=(154+246)-(283+117),
=400-400,
=0.