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
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