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= -6a + 2b - 4
2.
Doprowadź do najprostszej postaci.
a)
3 - (-2a - 4b - c ) -6 (x - 7y - 3z) =
= 3 + 2a + 4b + c - 6x + 42y + 18z
b)
2 (a - 3b) - 3 (a - b) -5 (4a +3b) =
= 2a - 6b - 3a + 3b - 20a - 16b = -a - 3b - 20a - 16b =
= -21a - 19b
2a) 6a +12b +3c -6x + 42y + 18z= 2a + 4b + c -2x + 14y + 6z
2b) 2a - 6b -3a + 3b - 20a - 15b= -21a - 18b= -7a - 6b