方法1底边长面积乙4.42105263215.47368421甲7.57894736845.47368421甲-乙=30
方法2
乙底/12=7/(7+12)
乙底=84/19
甲底=12-乙底=12-84/19
S甲+S乙=1/2×(12-84/19)×12-1/2×84/19×7=30
方法1底边长面积乙4.42105263215.47368421甲7.57894736845.47368421甲-乙=30
方法2
乙底/12=7/(7+12)
乙底=84/19
甲底=12-乙底=12-84/19
S甲+S乙=1/2×(12-84/19)×12-1/2×84/19×7=30