Вправи: 98

98. Спрости вираз.

a) ac+bx+ax+bcay+2bx+2ax+by = ca+b+ x(a+b)ya+b+ 2x(a+b) = a+b(c+x)a+b(y+2x) = c+xy+2x;

б) x2- a-bx-abx3+ bx2+ ax+ab = x2- ax+bx-abx2x+ b+ a(x+b) = xX-a+ b(x-a)x+b(x2+ a) = x-a(x+b)x+b(x2+ a) = x-ax2+ a;

в) (x+a)2- (z+c)2x+z2-(a+c)2 = x+a-z-c(x+a+z+c)x+z-a-c(x+z+a+c) = x+a-z-cx+z-a-c.