1樓：瀛洲煙雨
725x0.068十72.5x1.
17十0.725x15=725×0.068+725×0.
117+725×0.015=725×（0.068+0.
117+0.015）=725×0.2
=145
2樓：快樂無限
725x0.068十72.5x1.17十0.725x15=7.25x6.8+7.25x11.7+7.25x1.5=7.25x20
=145
希望能幫到你！
3樓：
725x0.068十72.5x1.17十0.725x15=72.5x（0.68+1.17+0。15）=72.5x2
=145
4樓：匿名使用者
=0.725x1000x0.068+0.725x100x1.17+0.725x15
=0.725x68+0.725x117+0.725x15=0.725x(68+117+15)
=0.725x200
=145