zadanie 9/164 matematyka z plusem 1
oblicz wartość wyrażenia :
a) x do kwadratu + x - 1 dla x = -1
b) 2(-x+4) dla x= -10
c) 1-y +x dla x=2 i y = -1
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a) x² + x - 1 = (-1)² + (-1) - 1 = 1 - 1 - 1 = 0 - 1 = - 1
b) 2(-x+4) = -2x + 8 = - 2 * (-10) + 8 = 20 + 8 = 28
c) 1-y +x = 1 - (-1) + 2 = 1 + 1 + 2 = 4
a)
(-1 do kw.) +(-1)-1= 1-1-1=-1
b)
2[-(-10)+4]=2*14=28
c)
1-(-1)+2=1+1+2=4