0.5 + (- 1 / 4)- (- 2.75)+ 1 / 2
= 0.5 - 0.25 + 2.75 + 0.5
= 0.5 + 0.5 + 2.5
= 1 + 2.5
= 3.5
【俊狼猎英】团队为你解答
0.5+【-4分之1】-【-2.75】+2分之1
=0.5-0.25+2.75+0.5
=(0.5+0.5)+(2.75-0.25)
=1+2.5
=3.5
1/2 -1/4 +(2+3/4)+1/2
=1+2 +3/4-1/4
=3+1/2
=3.5
原式=0.5-0.25+2.75+0.5=3.5
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