Question

一道英文数学题

a retangle is four times as long as it is wide. if the area of the rectangle is 1600cm, waht are its dimensions??? 啊，不会做呀！！帮帮忙，把过程打出来吧

Answer 1

A rectangle is four times as long as it is wide. if the area of the rectangle is 1600cm, waht are its dimensions

一个长方形的长是宽的4倍，长方形的面积是1600cm²，长、宽各为多少？

Solution：
Let x be the width of the rectangle
So, x × 4x = 1600, 4x² = 1600，x² = 400， x = square root of 400 = 20 cm.
The length = 20×4 = 80 cm
So, the dimensions are 80cm × 20cm.

平方 = square of ...., to the power of 2
开平方 = square root of ...., root ....
开立方 = cubic root of .....

Answer 2

一个长方形长是宽的4倍，如果长方形的面积是1600，则他的长和宽是多少？
x*4X=1600
x=20cm
则长是80cm，宽是20cm

追问

20是怎么来的？？？

追答

开平方

追问

开平方是什么？？？square root 吗？or exponent??

追答

square root吧 ，用这个