Odpowiedzi

2010-03-10T16:07:01+01:00
A)3(2²-2*2+3)-2*(2²-5*2-1)=3*3-2*-7=9-(-14)=23
2010-03-10T16:20:20+01:00
A) 3x²-6x+9 - 2x²+ 10x +2 = x² + 4x +11
2² + 4·2 + 11 = 4 + 8 + 11= 23

b) a(2ab +b)- b(a-2ab+a²)=2a²b + ab - ab +2ab² - a²b = a²b + 2ab²
(0,1)²·(-10)+2·(0,1)·(-10)²=0,01·(-10)+ 0,2· 100 = -0,1 + 20 = 19,9