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2) a(2a -b + 1) - 2a(a-3b-1) = 2a^2 - ab + a - 2a^2 + 6ab + 2a = 5ab + 3a
3) 2(-5x -3) -3(x-2) = -10x - 6 - 3x + 6 = -13x
4) (2c - 3)(-c + 4) = -2c^2 + 8c + 3c -12 = -2c^2 + 11c - 12
5) -(3x-y) -5(x-2y-1) = -3x + y -5x + 10y + 5 = -8x + 11y + 5
wyrażenie ^2 oznacza „do potęgi drugiej”. Dobrego dnia i liczę na naj.