9×55+49 128×8 302×25 用简便方法计算过程.
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/06/24 06:32:55
9×55+49 128×8 302×25 用简便方法计算过程.
![9×55+49 128×8 302×25 用简便方法计算过程.](/uploads/image/z/18180054-54-4.jpg?t=9%C3%9755%2B49+128%C3%978+302%C3%9725+%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97%E8%BF%87%E7%A8%8B.)
9×55+49 =9×(49+6)+49 =9×49+9×6+49 =9×49+49+54 =(9+1)×49+54 =490+54 =544 128×8 =(125+3)×8 =125×8+3×8 =1000+24 =1024 302×25 =(300+2)×25 =300×25+2×25 =7500+50 =7550