解答:⑴方程解法:假設(shè)進(jìn)行運(yùn)算后四個(gè)數(shù)都變成x,那么甲數(shù)是x-2,乙數(shù)是x+2,丙數(shù)是0.5x,丁數(shù)是2x.可以根據(jù)題目條件列出方程:(x-2)+(x+2)+0.5x+2x=1296
整理得到4.5x=1296,解得x=288.所以甲數(shù)是288-2=286,乙數(shù)是288+2=290,丙數(shù)是288÷2=144,丁數(shù)是288×2=576.
、扑阈g(shù)解法:四個(gè)數(shù)相等時(shí),每個(gè)數(shù)均可看成是“1”份,那么可知:甲數(shù)原來是1份少2;乙數(shù)原來是1份多2;丙數(shù)原來是0.5份;丁數(shù)原來是2份.從而可得出每份:(1296+2-2)÷(1+1+0.5+2)=1296÷4.5=288,由此可知:甲數(shù)是286,乙數(shù)是290,丙數(shù)是144,丁數(shù)是576.