Oblicz wyrażenia algebraiczne:
a) 2x²-y+x3 dla x=-2, y=¼
b) -x³-y²-5z+10 dla x=-2, y=-1/5,z= 2/5
c)(x+2/x)*(-2/x-x²) dla x= -1
d) (-2mn+1/5 KL)² dla m= -¼, n=8,k=-2,l=10
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a)
2x²-y+x3 dla x=-2, y=¼
2*(-2)²-1/4+(-2)³=2*4-1/4+(-8)=8-1/4+(-8)=
=7 3/4+(-8)=-1/4=-0,25
b)
-x³-y²-5z+10 dla x=-2, y=-1/5,z= 2/5
-(-2)³-(-1/5)²-5*2/5+10=8-1/25-2=7 24/25-2=5 24/25=5,96
c)
(x+2/x)*(-2/x-x²) dla x= -1
(-1+2/-1)*(-2/-1-(-1)²=(-1-2)*(2-1)=-3*1=-3
d)
(-2mn+1/5 KL)² dla m= -¼, n=8,k=-2,l=10
(-2*(-1/4)*8+1/5*(-2)*10)²=(4+(-4))²=0
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