急!懂英语和数学的来啊!The length and width of a rectangle are 12cm and 5cm respectively. If the length is increased by 50% and the width is decreased by 20%.(a)Find the original area of the rectangle.(b)Find the new area of the rectangle.(c

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急!懂英语和数学的来啊!The length and width of a rectangle are 12cm and 5cm respectively. If the length is increased by 50% and the width is decreased by 20%.(a)Find the original area of the rectangle.(b)Find the new area of the rectangle.(c
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急!懂英语和数学的来啊!The length and width of a rectangle are 12cm and 5cm respectively. If the length is increased by 50% and the width is decreased by 20%.(a)Find the original area of the rectangle.(b)Find the new area of the rectangle.(c
急!懂英语和数学的来啊!
The length and width of a rectangle are 12cm and 5cm respectively. If the length is increased by 50% and the width is decreased by 20%.
(a)Find the original area of the rectangle.
(b)Find the new area of the rectangle.
(c)Find the percentage increase in the area of the rectangle.

急!懂英语和数学的来啊!The length and width of a rectangle are 12cm and 5cm respectively. If the length is increased by 50% and the width is decreased by 20%.(a)Find the original area of the rectangle.(b)Find the new area of the rectangle.(c
先对一些词翻译：length——长度 width——宽度 rectangle——矩形 respectively——各自地 increased——被增加 decreased——被减少 original——最初的 area——面积 percentage——百分比
翻译：一个长方形的长和宽分别是12cm和5cm.如果长度增加50%,宽度减少20%
（1）求原长方形的面积；
（2）求新长方形的面积；
（3）求长方形面积增加的百分比是多少.
（1）12×5=60（平方厘米）
（2）12×（1+50%）×5×（1-20%）=72（平方厘米）
（3）（72-60）÷60×100%=20%

a）12乘以5=60
b) 12(100%+50%）乘以5（100%-20%）=72
c) 72-60=12

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