Вправи: 1099

1099. Спрости вираз.

a) 2a2- 10aa2- 2a-3 • a2+2a-15a2- 25 – a-1a+1 = 2a(a-5)a-3(a+1) • a+5(a-3)a-5(a+5) – a-1a+1 = 2aa+1 – a-1a+1 = 2a-a+1a+1 = a+1a+1 = 1.

б) (5x2+ 7x+12 – 1x2+ 5x+6 + xx2+ 6x+8)) • x+2(x+3x+1(x+6) = (5\x+2x+4(x+3) – 1\x+4x+2(x+3) + x\x+3x+2(x+4)) • x+2(x+3)x+1(x+6) = 5x+10-x-4+ x2+ 3xx+2x+3(x+4) • x+2(x+3)x+1(x+6) = x2+ 7x+6x+4 • 1x+1(x+6) = x+1(x+6)x+4 • 1x+1(x+6) = 1x+4.