(-5.75)+5又3/4 (-3又4/5)+(+4又5/6)=?(-3.87)+(+2.98)=?
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(-5.75)+5又3/4(-3又4/5)+(+4又5/6)=?(-3.87)+(+2.98)=?(-5.75)+5又3/4(-3又4/5)+(+4又5/6)=?(-3.87)+(+2.98)=?(-
(-5.75)+5又3/4 (-3又4/5)+(+4又5/6)=?(-3.87)+(+2.98)=?
(-5.75)+5又3/4 (-3又4/5)+(+4又5/6)=?
(-3.87)+(+2.98)=?
(-5.75)+5又3/4 (-3又4/5)+(+4又5/6)=?(-3.87)+(+2.98)=?
(-5.75)+5又3/4 =-5.75+5.75=0
(-3又4/5)+(+4又5/6)=-3+4-4/5+5/6=1+(-24+25)/30=1+1/30=1又1/30
(-3.87)+(+2.98)=-0.89