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7xy+10y-2xy=10y+5xy
5a³+4a²-6+a²-8a³=-3a³+5a²-6
4x²-(2x+7x²)=4x²-2x-7x²=-3x²-2x
3a(a+4)-a²=3a²+12a-a²=2a²+12a
(8-2a)(3a+1)=24a+8-6a²-2a=-6a²+22a+8
(x+5)²=x²+25+10x
(1-2z)²=1+4z²-4z
(3a-b)*(3a+b)=9a²-b²
2(3x)²-(2x+3)²+x(4-x)=2*9x²-(4x²+9-12x)+4x-x²=18x²-4x²-9+12x+4x-x²=13x²+16x-9
2)
x²+2
3y+0,5x
3)
6ab+4a+12a²=2a(3b+2+6a)
4)
x²+6x+9=0
(x+3)²=0
x+3=0
x=-3
5)
4x²(3x-9)+(6x+1)²-12x=12x³-36x²+36x²+1+12x-12x=12x³+1=12*(1/4)³+1=12*(1/64)+1=12/64+1=3/16+1=1 3/16