Question

第一张图片的中间6道题和

Answer 1

(1)m*(m+2n) (2) (11a-3b)*(3a-11b)

(3)3*(x+y)*(x-y) (4) (x^2+y^2+xy)*(x^2+y^2-xy)

(5)3a(x-y^2)*(x+y^2) (6) (p-1)*(p+1)*(p^2+1)

环面积S=（R^2-r^2)*π 第二问可以用平方差算s=π*(r+R)(R-r)=3.14*11.9*5

p4-1=(p2+1)(p2-1)

S=(R2-r2)*圆周率=（71.4025-11.9025）*3.14=186.83

m(m+2n) (11a-3b)^2-56(a-b)(a+b) 3(x+y)(x-y) (x2+y2+xy)(x2+y2-xy)

3a(x-y2)(x+y2) (p2+1)(p2-1)