136×21-42×18怎么简便运算
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/29 21:43:16
136×21-42×18怎么简便运算
136×21-42×18怎么简便运算
136×21-42×18怎么简便运算
136×21-42×18
=136×21-18×2×21
=(136-36)×21
=100×21
=2100
136×21-42×18
=68×42-42×18
=42×(68-18)
=42×50
=2100
136×21-42×18怎么简便运算
136×21-42×18怎么简便运算
136×21-42×18怎么简便运算
136×21-42×18
=136×21-18×2×21
=(136-36)×21
=100×21
=2100
136×21-42×18
=68×42-42×18
=42×(68-18)
=42×50
=2100