计算:1.1+4.4+7.7+10.10+13.13+……+55.55+58.58
来源:学生作业帮 编辑:搜搜考试网作业帮 分类:数学作业 时间:2024/08/03 17:22:19
计算:1.1+4.4+7.7+10.10+13.13+……+55.55+58.58
原式=(1+4+7+10+13......+58)+(0.1+0.4+0.7)+(0.10+0.13……+0.55+0.58)
=(1+58)*20/2+1.2+(0.10+0.58)* 17/2 =596.98
原式=(1+4+7+10+13......+58)+(0.1+0.4+0.7)+(0.10+0.13……+0.55+0.58)
=(1+58)*20/2+1.2+(0.10+0.58)* 17/2 =596.98
![计算:1.1+4.4+7.7+10.10+13.13+……+55.55+58.58](/uploads/image/z/8057010-66-0.jpg?t=%E8%AE%A1%E7%AE%97%3A1.1%2B4.4%2B7.7%2B10.10%2B13.13%2B%E2%80%A6%E2%80%A6%2B55.55%2B58.58)
原式=1+0.1+4+0.4+7+0.7+……+58+0.58
=1+4+7+10+……+58+(0.1+0.4+0.7)+(0.10+0.13+0.16+……+0.55+0.58)
=(1+58)×20÷2+1.2+(0.10+0.58)×17÷2
=590+1.2+5.78
=598.98
=1+4+7+10+……+58+(0.1+0.4+0.7)+(0.10+0.13+0.16+……+0.55+0.58)
=(1+58)×20÷2+1.2+(0.10+0.58)×17÷2
=590+1.2+5.78
=598.98