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Брюс112
@Брюс112
August 2021
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Вводные упражнения (номер 1;2;3)
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parus77
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1. 1.)х=-8 у=-3, х=0 у=-3 , х=5 у=4 ,х=9 у=10
2)у=-7 х=-10 х=7 , у=-3 х=-8 х=0., у=1 х=-4 х=-2
2. 1) у=-3х+5 у(0)=-3*0+5=5 у(3)=-3*3+5=-9+5=-4
у(-2)=-3*(-2)+5=6+5=11
2) -3х+5=0 -3х+5=-1 -3х+5=2
-3х=-5 -3х=-1-5 -3х=2-5
х=5\3 -3х=-6 -3х=-3
х=1 2\3 х=-6:(-3) х=-3:(-3)
х=2 х=1
3. 6х²-х-1=0 Д=(-1)²-4*6*(-1)=1+24=25 √д=√25=х
х1=(1+5)\12=6\12=1\2 х2=(1-5)\12=-4\12=-1\3
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1. 1.)х=-8 у=-3, х=0 у=-3 , х=5 у=4 ,х=9 у=102)у=-7 х=-10 х=7 , у=-3 х=-8 х=0., у=1 х=-4 х=-2
2. 1) у=-3х+5 у(0)=-3*0+5=5 у(3)=-3*3+5=-9+5=-4
у(-2)=-3*(-2)+5=6+5=11
2) -3х+5=0 -3х+5=-1 -3х+5=2
-3х=-5 -3х=-1-5 -3х=2-5
х=5\3 -3х=-6 -3х=-3
х=1 2\3 х=-6:(-3) х=-3:(-3)
х=2 х=1
3. 6х²-х-1=0 Д=(-1)²-4*6*(-1)=1+24=25 √д=√25=х
х1=(1+5)\12=6\12=1\2 х2=(1-5)\12=-4\12=-1\3