1
а) 3x³-6x²+9x
б) 10y²-12y+5y-6=10y²-7y-6
2) a²-3a+6a-18+a²+5a-4a-20=2a²+4a-38=
a²+2a-19
3) 14x²-(14x²+8x-21x-12)=14
14x²-14x²-8x+21x+12=14
13x=2
x=13/2=6.5
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1
а) 3x³-6x²+9x
б) 10y²-12y+5y-6=10y²-7y-6
2) a²-3a+6a-18+a²+5a-4a-20=2a²+4a-38=
a²+2a-19
3) 14x²-(14x²+8x-21x-12)=14
14x²-14x²-8x+21x+12=14
13x=2
x=13/2=6.5