1)3*0,125-((4/9)-(3/7))*(63/8)=0,375-((28/63)-(27/63))*(63/8)=0,375-(1/63)*(63/8)=0,375-(1/8)=0,375-0,125=0,25
2)a²+4a+4-(a²+a-a-1)=a²+4a+4-a²-a+a+1=4a+4+1=4a+5
4)√4-6*√(1/36)=2-6*(1/6)=2-1=1
5)A)x²+3x-4=0
D=b²-4ac=9+16=25
x1=(-b-√D)/(2a)=(-3-5)/2=-8/2=-4
x2=(-b+√D)/(2a)=(-3+5)/2=2/2=1
Б)x²-5x=0
x(x-5)=0
x=0
x=5
В)x²-8x+16=0
D=64-64=0
x=(-b)/(2a)=8/2=4