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a) (1/3x-4)²-x(1/2x-1)² dla x=6
b) 0,5x²(4c³-5) dla x=-2, c=1
c) 8a³+(b²+6):c dla a=-1 b=-2 c=8
d) 4x-(5y²+8z³) dla x= -1/4 y=0,2 z=-1
e) 3m³+2(m²-3(2m-1)) dla m= 1/3
f) 16z²-2
---------- +z dla z= 1/4
2,1-6,4·z³
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(1/3 · 6 -4)² - 6 ·(1/2 · 6 -1)² = (2-4)² -6 ·(3-1)² = (-2)² -6 · 2² = 4 -6 · 4 =
= 4 -24 = -20
b).0,5x²(4c³ -5) dla x= -2 , c=1
0,5 ·(-2)² ·(4 ·1³ -5) = 0,5·4·(4-5) = 2 ·(-1) = -2
c).8a³ +(b² +6) : c dla a= -1 , b = -2 , c = 8
8 ·(-1)³ +((-2)² +6) : 8 = 8 ·(-1) +(4+6) : 8 = -8+10:8 = -8 +10/8 =
= -8 +5/4 = -7 i 4/4 +1 i 1/4 = -6 i 3/4
d).4x -(5y² +8z³) dla x= -1/4 , y = 0,2 , z = -1
4 ·(-1/4) - (5 ·0,2² +8 ·(-1³)) = -1 - (5·0,04 +8 ·(-1)) = -1 - (0,2 -8) =
= -1 -(-7,8) = -1 +7,8 = 6,8
e).3m³ +2(m²-3(2m-1)) dla m = 1/3
3 · (1/3)³ +2 · ((1/3)² -3 · (2 · 1/3 -1)) = 3 · 1/27 +2 · (1/9 - 3 ·(2/3 -1)) =
= 1/9 +2 ·(1/9 - 3 · (-1/3)) = 1/9 +2 ·(1/9 +1) = 1/9 +2 · 1 i 1/9 =
= 1/9 +2 · 10/9 = 1/9 +20/9 = 21/9 = 2 i 3/9 = 2 i 1/3