0.5+(-1)/4-(-2.75)+1/2 = 3.5 (-2/3)+(-1/6)-(-1/4)-1/2 =.第二题求过程和结果

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0.5+(-1)/4-(-2.75)+1/2 = 3.5 (-2/3)+(-1/6)-(-1/4)-1/2 =.第二题求过程和结果
0.5+(-1)/4-(-2.75)+1/2 = 3.5 (-2/3)+(-1/6)-(-1/4)-1/2 =.第二题求过程和结果

0.5+(-1)/4-(-2.75)+1/2 = 3.5 (-2/3)+(-1/6)-(-1/4)-1/2 =.第二题求过程和结果
0.5+(-1)/4-(-2.75)+1/2
=(0.5+0.5)+(2.75-0.25)
=1+2.5
=3.5
(-2/3)+(-1/6)-(-1/4)-1/2
=-2/3-1/6+1/4-1/2
=-8/12-2/12+3/14-6/12
=-13/12
如果本题有什么不明白可以追问,

0.5+(-1)/4-(-2.75)+1/2
=0.5-0.25+2.75+0.5
=0.25+3.25
= 3.5


(-2/3)+(-1/6)-(-1/4)-1/2
=-8/12-2/12+3/12-6/12
=-14/12+3/12
=-11/12