Объяснение:
4. а) [tex](2x-5)^2=4x^2-10x+25[/tex]
б) [tex](2x+3y)(2x-3y)=4x^2-9y^2[/tex]
5. [tex]623^2-46*623+23^2=(623-23)^2=600^2=360.000[/tex]
6. [tex](x+y)^2+(x-y)^2=x^2+2xy+y^2+x^2-2xy+y^2=2x^2+2y^2=2(x^2+y^2)[/tex]
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Answers & Comments
Объяснение:
4. а) [tex](2x-5)^2=4x^2-10x+25[/tex]
б) [tex](2x+3y)(2x-3y)=4x^2-9y^2[/tex]
5. [tex]623^2-46*623+23^2=(623-23)^2=600^2=360.000[/tex]
6. [tex](x+y)^2+(x-y)^2=x^2+2xy+y^2+x^2-2xy+y^2=2x^2+2y^2=2(x^2+y^2)[/tex]