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4x³-8x²-20x+8-2x³+3x²-5x=2x³-5x²-25x+8
b) 2x(x²-3x+7)+3(x³-2x²+4)
2x³-6x²+14x+3x³-6x²+12=5x³-12x²+14x+12
c) 3(1½a-2b-¼c)-2(-3a-4½b-⅛c)
9/2a-6b-3/4c+6a+9b+1/4c=21/2a+3b-1/2c
d) 1½(2a-3b-c)-2½(a-2b+c)
3a-9/2b-1 1/2c-2 1/2a+5b-2 1/2c=1/2a+1/2b-4c
b)2x³-6x²+14x+3x³-6x²+12=5x³-12x²+14x+12
c)4½a-6b-3¼c-2½a+5b-2⅛c=2a-b-5¼c
d)3a-4½b-1½c-2½a+5b-2½c=½a+½b-4c
b) 2x(x²-3x+7)+3(x³-2x²+4)=2x³-6x²+14x +3x³-6x²+12=5x³-12x²+14x+12
c) 3(1½a-2b-¼c)-2(-3a-4½b-⅛c)=3(3/2a-2b-1/4c)-2(-3a-9/2b-1/8c)=
9/2a-6b-3/4c+6a+9b+1/4c=10i1/2a+3b-1/2c
d) 1½(2a-3b-c)-2½(a-2b+c) =3/2(2a-3b-c)-5/2(a-2b+c)=
3a-9/2b-3/2c-5/2a+10b-5/2c=1/2a +5i1/2b-4c
(/---->oznacza kreskę ułamkową)