doprowadź do najprostszej postaci:
(a-b)²-(a-b)(a+b)=
(2x-3)²+(x+1)(x-a)
-(3x-5)(3x+5)+(x-10)²
2(½x-y)²-6(⅔x+1)(⅔x-1)
potrzebne ja już, proszę:)
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rozwiązanie w załaczniku
(a-b)²-(a-b)(a+b)==a²-2ab+b²-(a²-b²)=a²-2ab+b²-a²+b²=2b²-2ab=2b(b-a)
(2x-3)²+(x+1)(x-a)=4x²-12x+9+(x²+x-ax-a)=4x²-12x+9+x²+x-ax-a=5x²-11x+9-ax-a
-(3x-5)(3x+5)+(x-10)²=-(9x²-25)+(x²-20x+100)=-9x²+25+x²-20x+100=-8x²-20x+125
2(½x-y)²-6(⅔x+1)(⅔x-1)=2(¼x²-xy+y²)-6(⁴/₉x²-1)=½x²-2xy+2y²- ²⁴/₉x² +6=
-2⅙x²-2xy+2y²+6