the length of a rectangle is twice its width.the length of a rectangle is twice its width.If the width of the rectangle is changing at 2in/s,how fast is the area of the rectangle changing when the area is 32 in^2?
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/16 22:08:06
![the length of a rectangle is twice its width.the length of a rectangle is twice its width.If the width of the rectangle is changing at 2in/s,how fast is the area of the rectangle changing when the area is 32 in^2?](/uploads/image/z/9198489-57-9.jpg?t=the+length+of+a+rectangle+is+twice+its+width.the+length+of+a+rectangle+is+twice+its+width.If+the+width+of+the+rectangle+is+changing+at+2in%2Fs%2Chow+fast+is+the+area+of+the+rectangle+changing+when+the+area+is+32+in%5E2%3F)
the length of a rectangle is twice its width.the length of a rectangle is twice its width.If the width of the rectangle is changing at 2in/s,how fast is the area of the rectangle changing when the area is 32 in^2?
the length of a rectangle is twice its width.
the length of a rectangle is twice its width.If the width of the rectangle is changing at 2in/s,how fast is the area of the rectangle changing when the area is 32 in^2?
the length of a rectangle is twice its width.the length of a rectangle is twice its width.If the width of the rectangle is changing at 2in/s,how fast is the area of the rectangle changing when the area is 32 in^2?
area = width * length = 2width^2
d area/dt = 4width dwidth/dt
when area=32in^2,width=4
so d area/dt = 4*4*2 = 32 in/s
长方形的长度是宽带两倍