10ab-(a+5b)^2= 10ab-a²-10ab-15b²=-a²-15b²=-1²-15*1²=-16
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10ab-(a+5b)^2= 10ab-a²-10ab-15b²=-a²-15b²=-1²-15*1²=-16
При b=-1 , a=1
10*1*(-1)-1-25*(-1)^2= -10-1-25+1=-35