1)(b+6)(b-6)-3(b+2) 2)(3a-2)(3a+2)+(a-8)(a+8) 3)(5x-3y)(5x+3y)+(3x-5y)(3x+5y) - вопрос №77246411663223232883535335354 от Saaabiii 28.02.2020 05:55

Question

Алгебра: 1)(b+6)(b-6)-3(b+2) 2)(3a-2)(3a+2)+(a-8)(a+8) 3)(5x-3y)(5x+3y)+(3x-5y)(3x+5y) 4)(c-2)(3--c)(5+c)

Saaabiii · Answer

1) (b+6)(b-6)-3(b+2)=b²-36-3b-6=b²-3b-42
2) (3a-2)(3a+2)+(a-8)(a+8)=9a²-4+a²-64=10a²-68
3) (5x-3y)(5x+3y)+(3x-5y)(3x+5y)=25x²-9y²+9x²-25y²=34x²-34y²
4) (c-2)(3-c)-(5-c)(5+c)=3c-c²-6+2c-25+c²=5c-31