Oblicz.
a)17+(-10)-(-3)-9
b)(-5) *[3*(-2)-(-8)*(-1)]
c) (-6)do2 -(-7)do2
Niech x=-3 ,y=-1 i z=-2.Oblicz wartosc wyrażenia.
d)3xdo3yzdo2
e)5xydo3zdo 4
f)2x(y-3z)-3z(x+y do3)
g)xydo2-xdo2z-xyz
(do2 lub do3 tak zapisałam potęgi )
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Oblicz:
a)
17+(-10)-(-3)-9 = 17-10+3-9 = 20-19 = 1
b)
(-5)*[3(-2)-(-8)(-1)] = (-5)*(-6-14) = (-5)(-14) = 70
c)
(-6)^2 -(-7)^2 = 36-49 = -13
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Oblicz wartość wyrażenia dla: x = -2, y = -1, z = -2
d)
3x^3*yz^2 = 3*(-3)^3 *(-1) *(-2)^2 = 3*(-27)(-1)*4 =(-81)*(-4) = 324
e)
5xy^3*z^4 = 5*(-3)(-1)^3 *(-2)^4 = -15 *(-1)*16 = 15 *16 = 240
f)
2x(y-3z)-3z(x+y^3) = 2(-3)*[-1-3(-2)] -3(-2)*[-3+(-1)^3] =
= -6(-1+6) + 6(-3-1) = -6*5+6*(-4) = -30+(-24) = -30-24 = -54
g)
xy^2 -x^2 *z - xyz = -3*(-1)^2 -(-3)^2 *(-2) -(-3)(-1)(-2) =
= -3 *1-9*(-2) -(-6) = -3 +18 +6 = 24-3 = 21