A chess board consists of 5cm squares of Blackwood and maple (for the white squares) surrounded by an 8cm wide Blackwood

问题描述:

A chess board consists of 5cm squares of Blackwood and maple (for the white squares) surrounded by an 8cm wide Blackwood border.Find the percentage of the board which is made of maple?

一个国际象棋棋盘(应该见过吧,格子是黑白交错的那种),是两种木头组成的,一种是黒木(做成黑格),一种是枫木(做成了白格),每个格子边长五厘米(这得是很大的棋盘了),镶边用的是黒木,宽度是8厘米.问:枫木做的部分占棋盘的百分比是多少?那怎么做呀,你知道吗?算出总面积=64*(5*5)+4*(8*8)+4*(8*5)*8这里的第一部分是棋盘的六十四个格子,第二部分是四个角,第三部分是四条镶边枫木占得面积=32*(5*5)然后除一下