Update 4.md

Add "除".

Update 1.md

Update 1.md

update LoopingaTriangle.

change "A" to "a"

change “A” to "a"

change the "9亿亿" to "9000 万亿"

Update 4.md

Update 14.md

image重复定义.

修正Object单词拼写错误

不规则四边形=>梯形