矩形的长度比宽度多5。周长是22英尺。你怎么找到长度和宽度?

矩形的长度比宽度多5。周长是22英尺。你怎么找到长度和宽度?
Anonim

回答:

#W = 11/6“ft”= 1“ft”10“英寸”= 22“英寸”#

#L = 9“ft”2“英寸”= 110“英寸”#

说明:

鉴于: #L = 5W#,周界 #= 22“ft”#

周长, #P = 2L + 2W#

替换为您给定的值:

#22 = 2(5W)+ 2W#

分配和解决 #W#:

#22 = 10W + 2 W#

#22 = 12W#

#W = 22/12 = 11/6“ft”= 1“ft”10“英寸”= 22“英寸”#

#L = 5W = 5 * 11/6 = 55/6 = 9“ft”2“英寸”= 110“英寸”#

回答:

长度:8

宽度:3

说明:

#一个#=长度;

#B#=宽度;

#A = B + 5# - >长度比宽度多5

#22 = 2A + 2B# - > div all 2

#11 = A + B#

#B = 11-A#

#B = 11-B-5#

#2B = 6#

#B = 3#

#A = B + 5 = 3 + 5 = 8#

#2*8+2*3=16+6=22# - >正确