=7.5-7/3-22.5-20/3+0.75-2.8-0.2-1.25-1/3+2.5-3.25-31/6-3/5+2/5-0.25-0.05
=(7.5-22.5+2.5)-(7/3+20/3+1/3+31/6)+(0.75-1.25-3.25-0.25-0.05)-(2.8+0.2)-(3/5-2/5)
=-12.5-14.5-4.05-3-0.2
=-34.25
(另外,请再检查一下自己的式子有没有抄错.重点检查最后一排.)
=7.5-7/3-22.5-20/3+0.75-2.8-0.2-1.25-1/3+2.5-3.25-31/6-3/5+2/5-0.25-0.05
=(7.5-22.5+2.5)-(7/3+20/3+1/3+31/6)+(0.75-1.25-3.25-0.25-0.05)-(2.8+0.2)-(3/5-2/5)
=-12.5-14.5-4.05-3-0.2
=-34.25
(另外,请再检查一下自己的式子有没有抄错.重点检查最后一排.)