13)Do liczby -18 dodaj różnicę liczby -11 i liczby -9,5
-18 + [-11 - (-9.5)] = -18 + [-11 + 9.5] = -18 + (-1.5) = -18 - 1.5 = -19.5
-18+(-11-(-9,5))= -18+(-11+9,5)=-18+(-1,5)= -19,5 :)
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-18 + [-11 - (-9.5)] = -18 + [-11 + 9.5] = -18 + (-1.5) = -18 - 1.5 = -19.5
-18+(-11-(-9,5))= -18+(-11+9,5)=-18+(-1,5)= -19,5 :)