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Please help ASAP!!! Thank you!!!

Please Help ASAP Thank You class=

Sagot :

(1)

=(a+b+c)(x+y)

=a(x+y)+b(x+y)+c(x+y)

=ax+ay+bx+by+cx+cy

(2)

=(x+y+z) (x-y)

=x(x-y)+y(x-y)+z(x-y)

=x2-xy+xy -y2+zx-yz

=x2+zx-y2-yz

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