a) (p+0.6)(p-0.6) = p²- 0.36 при p=0.2
0.2²- 0.36 = 0.04 - 0.36 = -0.32
b) k + 2/3(k - 2/3) = k + 2/3k - 4/9 = 1 2/3k - 4/9 при k= 1/6
1 2/3*1/6 - 4/9 = 5/3*1/6 - 4/9 = 5/18 - 8/18 = -1/6
c) 2x+3y-5 при x= -1/2 y= -1/8
2*(-0.5)+3*(-0.125)-5 = -1-0.375-5 = -6.375
d) 2x²-3y² при x= -1 y=2
2*(-1)²-3*2² = 2-12 = -10
a) (p+0.6)(p-0.6) = p²- 0.36 при p=0.2
0.2²- 0.36 = 0.04 - 0.36 = -0.32
b) k + 2/3(k - 2/3) = k + 2/3k - 4/9 = 1 2/3k - 4/9 при k= 1/6
1 2/3*1/6 - 4/9 = 5/3*1/6 - 4/9 = 5/18 - 8/18 = -1/6
c) 2x+3y-5 при x= -1/2 y= -1/8
2*(-0.5)+3*(-0.125)-5 = -1-0.375-5 = -6.375
d) 2x²-3y² при x= -1 y=2
2*(-1)²-3*2² = 2-12 = -10