因式分解-25x^2-30xy-9y^21.-25x^2-30xy-9y^22.34^2+3432+16^23.38.9^2-238.9+48.9^24.54.5^2-30*16.35+4.5^2

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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

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
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

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
1.-25x^2-30xy-9y^2
=-(25x²+30xy+9y²)
=-(5x+3y)²
2.34^2+34*32+16^2
=34²+2*34*16+16²
=(34+16)²
=50²
=2500
3.38.9^2-2*38.9*48.9+48.9^2
=(38.9-48.9)²
=(-10)²
=100
4.54.5^2-30*16.35+4.5^2
=这个题目好像是错的

-25x^2-30xy-9y^2
=-(25x^2+30xy+9y^2)
=-(5x+3y)²

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

4^2+34*32+16^2

1.(-5x+3y)(5x-3y)
2.(34+16)^2=2500
3.37.9^2+49.9*47.9 晕
4.继续晕

人家叫因式分解。。

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