设小矩形长为 x ,宽为 y ,
(3x+y+x)*2=68 ,
(3x+y)x=7xy ,
解方程组得:
x=68/9=7又(5/9) ,
y=34/9=3又(7/9) ,
S长方形
= 7xy
= 7(68/9)(34/9)
= 16184/81
= 199又(65/81) (cm²)
设小矩形长为 x ,宽为 y ,
(3x+y+x)*2=68 ,
(3x+y)x=7xy ,
解方程组得:
x=68/9=7又(5/9) ,
y=34/9=3又(7/9) ,
S长方形
= 7xy
= 7(68/9)(34/9)
= 16184/81
= 199又(65/81) (cm²)