1、r^2-2rh+h^216x^2+24xy+9y^2a^2+2ab+b^21/4m^2-2m+4
1/16x^2-1/3xy+4/9y4x^2-10x-6.25
2、4x^2-4x+1y^2-4X^2
a^2-25-a^2+2ab-1
3、x=a-30(100-30)^2=4900cm^2
4、4x+12a^2-10ab-9b^2
5、(2ax)^2a^2x-4ax^2+4x^3
6、(2a+b/2+2a+b/2)^2-(2a-b)(2a+b)b^2
答案就发给你了,过程相信你一定会的吧!应用题我发了算式,你慢慢化简把,答案在后面.