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-2+(-8)-(-9)
(1)原式=(15-15)-(1/4-0.25)=0-0 =0(2)原式=8-66+0.25 =-58+0.25 =-57.75(3)原式=-2-12-(-4-3+6)/12 =-2-12-(-1/12)=-2-12+1/12 =-167/12
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