解设:直角三角形的面积x平方米(2*5/8*5x)^2+(2*8/8*5x)^2=6.8^2(1/4x)^2+(2/5x)^2=6.8^21/16x^2+4/25x^2=46.2425+64/16*25x^2=46.2489/400x^2=46.24x^2=46.24*400/89 (直角三角形面积=(长*短)/2 比是8:5比积是40 2*5...