1.40:x = y:40 =0.625
x=64 y=25
(40:64):(25:40) = 1
2.周长l.甲:S1=3l/10 * 2l/10
乙:S2=7l/24 * 5l/24 3 24 12
S1:S2 = 0.987 5 5 7 5