Doprowadź do najprostszej postaci.
A)3(a+2b-3c)+7(2a-4b+5c)-5(-3a - 4b - 5c)
B)-4(-2x+6y+5z)-8(9x+8y-7z) + 5(3x - 6y + 9z)
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a) 3(a+2b-3c)+7(2a-4b+5c)-5(-3a - 4b - 5c)=
3a + 6b -9c + 14a -28b+ 35c +15a + 20b+ 25c=
32a - 2b +51 c
b) -4(-2x+6y+5z)-8(9x+8y-7z) + 5(3x - 6y + 9z)=
8x - 24y - 20 z - 72x - 64y + 54z + 15x - 30y+ 45z=
-94x -118y + 69 z
3a+6b-9c+14a-28b+35c-(-15a-20b-25c)= 3a+ 6b-9c+14a-28b+35c+15a+20b+25c= 32a-2b+51c
8x-24y-20z-72x-64y+56z+15x-30y+45z= -49x-118y-37z