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b) 3x-((4x-2y)-2(x+3y))= 3x-(4x-2y-2x-6y) = 3x-(2x-8y)= 3x-2x+8y= x+8y
x+8y = -1+8*5=-1+40=39
Zad. 17
b) (-2x-4)²-(-3x²+2x-1) = 4x² +16+3x²-2x-1=15-2x+7x²
c)-2(-2x-4)-(-2x-4)+(x²-1)*(-2x-4)= 4x+8+2x+4+(-2x³-4x²+2x+4)= 4x+8+2x+4-2x³-4x² +4 = 8x+16-2x³-4x²
Zad. 20
c) (12x-15y)²-20(7x²+10y²-17xy)=144x²+225y²-140x²-200y²-340xy=4x²+25y²-340xy
4x²+25y²-340xy = 4*(5)²+25*(2)²-340*5*2= 100+100-34 000=-32 000
jeszcze pokombinuję z przykładem c z 19 :)