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[latex]2.\ a) -2a^{2} - 7c\ b) 10x - 14y - 3y + 7x = 17x - 17y = 17(x-y)\ c) 15x - 10 +6x^{2} -4x = 6x^{2} + 11x - 10\ d) 8x^{2}-2x-(x^{2}-4)=8x^{2} -2x-x^{2}+4=7^{2}-2x+4\ [/latex] [latex]5.\a) 2x+6x=+2=10\8x=8/8\x=1\b)frac{x}{3}-frac{x}{2}=2/6\2x-3x=12\-x=12/(-1)\x=-12\c)x^{2}+3x-2x-6=x^{2}\x=6\[/latex] [latex]6.\a)2c+2=3a\2c=3a-2/:2\c=frac{3a-2}{2}\b)frac{2}{c}=frac{a+b}{4}/4\frac{8}{c}=a+b/c\8=c(a+b)/:(a+b)\c=frac{8}{a+b}\c)frac{1}{a}=frac{2}{c}+frac{3}{2c}[/latex] [latex]frac{1}{a}=frac{4}{2c}+frac{3}{2c}\frac{1}{a}=frac{7}{2c}\2c=7a/:2\c=frac{7a}{2}[/latex]

a. X×Y+5 b. a² - 3 c. 12/100 ×K d. X×125% 2. a) 6a² − 3c + 2a² − 5c − 10a² + c = -2a²-8c+c b) 2(5x − 7y) − (3y − 7x) = 10x-14y - 3y-7x = 3x -17y c) (5 + 2x)(3x − 2) =15x-10+6x²-4x= 6x²-11x-10 d) 2x(4x − 1) − (x − 2)(x + 2) = 8x²-2x- (x² - 4) =8x² - 2x- x²+ 4 =7x² - 2x +4 5. Rozwiąż równania: a) 2x + 2(3x + 1) = 10 2x+6x+2=10 8x+2=10 8x=10-2 8x=8 x=8/8 x=1