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dla : x = 1/3 i y = 9
-1/2x³-xy+ 1/2x³y=-1/2*(1/3)³-1*9+1/2 * 1³* 9=-1/2*1/27-9+1/2*9=
-1/54+9+9/2=-1/54+9+243/54=9+242/54=9+4. 4/13/27=13. 43/27