编写求两个多项式相加的程序。 实验数据： P1(x)=5x8+3x4-2x3+3x+5 P2(x)=7x4+2x3-2x2 P(x)=P1(x)+P2(x)=5x8 +10x4-2x2+3x+5

def add_poly(p1, p2):
    result = {}
    for exp, coeff in p1.items():
        result[exp] = coeff + result.get(exp, 0)
    for exp, coeff in p2.items():
        result[exp] = coeff + result.get(exp, 0)
    return result

p1 = {8: 5, 4: 3, 3: -2, 5: 3}
p2 = {4: 7, 3: 2, 2: -2}
p3 = add_poly(p1, p2)
print(p3)  # {8: 5, 4: 10, 3: 0, 5: 3, 2: -2}