х²-15х+26=0
D=225-4*26=121
x1=(15+11)/2=13
x2=(15-11)/2=2
x²-15x+26=(x-2)(x-13)
-(-0,2)²= -0,04
-2/3*(-3)²= -2/3*9= -6
(-5)³*(-3/5)= -125*(-3/5)= 75
-(-3)²*(-2)³= -9*(-8)= 72