а). 2,5х-10-6х=3-х
2,5х-6х+х=3+10
-2,5х=13. х=-5,2
б).x^2-3x-10=0 D=9+4*10=49=7^2
x1=(3+7)/2=5. x2=(3-7)/2=-2
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а). 2,5х-10-6х=3-х
2,5х-6х+х=3+10
-2,5х=13. х=-5,2
б).x^2-3x-10=0 D=9+4*10=49=7^2
x1=(3+7)/2=5. x2=(3-7)/2=-2