a) -(5y-7x)+(3x-9y)= -5y+7x+3x-9y= -14y+10x
b) a(3b+4)-2b(3a-1)=3ab+4a-6ab+2b=4a+2b-3ab
c) 3(x-y)-8(x+y)+4(x+y)=3x-3y-8x-8y+4x+4y= -x-7y
d) (3x-6)(6+3x)=18x+9-36-18x=9-36
Mam nadzieję, że pomogłam♥︎
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a) -(5y-7x)+(3x-9y)= -5y+7x+3x-9y= -14y+10x
b) a(3b+4)-2b(3a-1)=3ab+4a-6ab+2b=4a+2b-3ab
c) 3(x-y)-8(x+y)+4(x+y)=3x-3y-8x-8y+4x+4y= -x-7y
d) (3x-6)(6+3x)=18x+9-36-18x=9-36
Mam nadzieję, że pomogłam♥︎