Rozwiążcie nie umiem :( Podręcznik Matematyka 1 nowe wydanie
Zad. 6/158
b)a(a+b+c)-b(a-b+c)-c(a-b-c)
c)x(x ²+2x+1)-(-4x²+8x² -6):2
d)12b*[(b-1):4]+14*[(b²-2b):21]-[(b-b²):3]
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b)a(a+b+c)-b(a-b+c)-c(a-b-c) = a²+ab+ac-ab+b²-bc-ac+bc+c² = a²+b²+c²
c)x(x²+2x+1)-(-4x²+8x²-6):2 = x³+2x²+x+2x²-4x²+3 = x³+x+3
d)12b*[(b-1):4]+14*[(b²-2b):21]-[(b-b²):3] = 3b²-3b + ⅔b² - ⁴/₃b - ⅓b + ⅓b² = 4b² - 4⅔b = b(4b-4⅔)