Выполните умножение: 1)(0,5х+у)*(0,5х-у)= 2)(a³-b²)*(a³+b²)= 3)(4a-b/2)*(4a+b/2)=...

Question

Выполните умножение:
1)(0,5х+у)*(0,5х-у)=
2)(a³-b²)*(a³+b²)=
3)(4a-b/2)*(4a+b/2)=
4)(2a/3-3b)*(2a/3+3b)=
5)(2x+y+z)*(2x-(y+z))=
6)(x+y-2z)*(x+y+2z)=
Решите плиз,срочно нужно.

Answer 1

1)(0,5х+у)*(0,5х-у)=0,25x²-y²
2)(a³-b²)*(a³+b²)=a^6-b^4
3)(4a-b/2)*(4a+b/2)=16a²-b²/4
4)(2a/3-3b)*(2a/3+3b)=4a²/9-9b²
5)(2x+y+z)*(2x-(y+z))=4x²-(y+z)²
6)(x+y-2z)*(x+y+2z)=(x+y)²-4z²

Comments

опечатка во втором пункте :)

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там ведь троечка в степени

Answer 2

1)=0.25x2-0.5xy+0.5xy-y2=1/4x2-y2
2)=a6+a3b2-a3b2-b4=a6-b4
3)=16a+2ab+2ab+b2/4
4)=4a2/9+2ab-2ab-9b2=4a2/9-9b2
5)=(2x+y+z)*(2x-y-z)=4x2-2xy-2xz+2xy-y2-yz+2xz-yz-z2=4x2-y2-z2
6)=x2+xy+2xz+xy+y2+2yz-2xz-2yz-4z2=x2+2xy+4xz+y2-2yz-2xz-4z2=x2+y2-4z2+2xz+2xy-2yz