(3.825-1.825)×1/4 +3.825×1/2-7.2×1/8+1.1×3/8+3.6×1/2-3.5×3/8=2×1/4+3.825×4×1/8-7.2×1/8+1.1×3×1/8+3.6×4×1/8-3.5×3×1/8=1/2+(15.3-7.2+3.3+14.4-10.5)×1/8=158/10
(1+2+3+4.+1998)/1999=(1+1998)×1998×1/2×1/1999=999
(7-5)+(9-7)+(11-9)+.(101-99)=2×95=190
第一题.（5-3-7-3+8-3-2+6）+（6/11-4/11-2/11-1/8+1/8-4/7-6/7+3/7)=1-1=0