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
问题描述：
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
答
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
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