因式分解-25x^2-30xy-9y^21.-25x^2-30xy-9y^22.34^2+34*32+16^23.38.9^2-2*38.9+48.9^24.54.5^2-30*16.35+4.5^2
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、原式=-(25x^2+30xy+9y^2)=-(5x+3y)^2
2、原式=34^2+34*16+34*16+16^2=34(34+16)+16(34+16)=(34+16)(34+16)=(34+16)^2=50^2=2500
答
人家叫因式分解。。
答
1.(-5x+3y)(5x-3y)
2.(34+16)^2=2500
3.37.9^2+49.9*47.9 晕
4.继续晕
答
-25x^2-30xy-9y^2
=-(25x^2+30xy+9y^2)
=-(5x+3y)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...
答
4^2+34*32+16^2