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2015-11-02 09:35:14
3) a)2x-7=11 => 2x=18 => x=9 x-8=0 => x=8 b)(x-1)(x+2)=0 => x=1; x=-2 x+2=0 => x= -2 4) a)2x-5=7 => 2x=14 => x=7 d)7x-5=5x+19 =>2x=24 => x=12 b)131+3y=11 => 3y=−120 => y= -40 e)4z-9=z+7 => 3z=16 => z=16/3 c)7t+18=9t => −2t=−18 => t=9 f)2(x-1)+5=2x+3 => 2x+3=2x+3 => x paote lua orice valoare din Z
2015-11-02 09:36:29
2x-5=7 7x-5=5x+19 2x=12 7x=5x+19+5 x=12:2 2x=24 x=6 x=24:2 x=12 131+3y=11 Asta e gresita 4z-9=z+7 4z=z+7+9 4z=z+16 3z=16 z=16:3 z=5 rest 1 7t+18=9t 2(x-1)+5=2x+3 9t-7t=18 2(x-1)+2=2x 2t=18 2x-2+2=2x t=9 2x=2x Coroana Plz
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