DAJE NAJ!! zapisz w jak najprostszej postaci: a) abc - (abc-(-xyz-(xyz- abc ))) b) s2t (2=do potęgi drugiej) - _st2 - ( st2 - s2t ))) c) x2yz - (xy2z - (xyz2 - (x2yz - xy2z))) PROSZE O SZYBKĄ POMOC!!!!!!!!!!!!!!! 2 = DO POTĘGI 2
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a)
abc - {abc-[-xyz-(xyz- abc )]}=
abc-{abc-[ -xyz -xyz+abc]}=
abc-{abc + xyz +xyz -abc}=
abc -abc -xyz - xyz + abc=
abc - 2xyz
b)
s^2t - st ^2 - ( st2 - s2t )=
s^2t - st^2 - st^2 + s^2t=
2s^2t - 2st^2
( ^2--------oznacza do potęgi drugiej)
c)
x^2yz - {xy^2z - [xyz^2 - (x^2yz - xy^2z) ]}=
x^2yz - {xy^2z - [xyz^2 - x^2 yz +xy^2z]}=
x^2yz - { xy^2z + xyz^2 + x^2yz -xy^2z}=
x^2yz - xy^2z-xyz^2 - x^2yz + xy^2z= -xyz^2