(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
(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