ProblemA=s2, s=9A = s^2,\ s = 9A=s2, s=9分步解答正方形的面积:A=s2A = s^2A=s2。代入 s=9s = 9s=9:A=81A = 81A=81。答案A=81A = 81A=81想解其他题?打开 area 求解器 →相关例题/solve/geometry/area-rectangle-5-by-8