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计算：(+3)+(+4)= (-2)+(+8)= (-0.25)+(+0.75)= (-2)+(-5)= (-9)+(+6)= 0+(-3.6)=
人气：276 ℃　时间：2020-03-28 12:36:46
解答
(+3)+(+4)= +7

(-2)+(+8)=+6

(-0.25)+(+0.75)=+0.5

(-2)+(-5)=-7

(-9)+(+6)=-3

0+(-3.6)=-3.6
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