wartość liczbowa wyrażenia; -4x (2-y) dla x=0,5 y=-3 wynosi oblicz
-4x (2-y)=-4*0,5(2-(-3))=-2*(2+3)=-2*5=-10
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-4x (2-y)=-4*0,5(2-(-3))=-2*(2+3)=-2*5=-10