因式分解-25x^2-30xy-9y^2
问题描述：
因式分解-25x^2-30xy-9y^2
1.-25x^2-30xy-9y^2
2.34^2+34*32+16^2
3.38.9^2-2*38.9+48.9^2
4.54.5^2-30*16.35+4.5^2
答
1.-25x^2-30xy-9y^2=-(25x²+30xy+9y²)=-(5x+3y)²2.34^2+34*32+16^2=34²+2*34*16+16²=(34+16)²=50²=25003.38.9^2-2*38.9*48.9+48.9^2=(38.9-48.9)²=(-10)²=1004.54.5^2...