3(x+y-6)-5(2x-y+3)+4(x-3-y)=
8(a+b)-(a-b)-7(2a-2b)=
(x2-5x-8)+(2x2 dodać 6x+7
sory że w ostatnim dodać napisałem słownie ale coś mi sie tu psuje
proszę o pełne wyliczenia dam dużo naj za najlepszą odp. jeszcze więcej.
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3(x+y-6)-5(2x-y+3)+4(x-3-y)=3x+3y-18-5(2x-y+3)+4(x-3-y)=3x+3y-18-(10x-5y+15)+4(x-3-y)=
=3x+3y-18-10x+5y-15+4(x-3-y)= -7x+3y-18+5y-15+4(x-3-y)= -7x+8y-18-15+4(x-3-y)=
= -7x+8y-33+4(x-3-y)= -7x+8y-33+4x-12-4y= -3x+8y-33-12-4y= -3x+8y-45-4y= -3x+4y-45
8(a+b)-(a-b)-7(2a-2b)=8a+8b-(a-b)-7(2a-2b)=8a+8b-a+b-7(2a-2b)=7a+8b+b-7(2a--2b)=
=7a+9b-7(2a-2b)=7a+9b-(14a-14b)=7a+9b-14a+14b= -7a+9b+14b= -7a+23b
(x²-5x-8)+(2x²+6x+7)=3x²-5x-8+6x+7=3x²+x-8+7=3x²+x-1