решите уравнение подбором корней

a)  x^2-3x-10=0 
b) u^2-4u-5=0
с) u^2+7U-60=0
e)  y^2+y-56=0
r) z^2-11z+18=0
t) x^2+5x-6=0
y) y^2-14y+33=0
u) t^2+7t-18=0
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