计算 写过程
-8-(-21)(-32)-(-12)-5-(-15)(-3又2/3)-(-2又3/4)-(-7又2/3)-(+2.75)(-1)-(+1又1/2)-(-2又1/4)-2...
-8-(-21)
(-32)-(-12)-5-(-15)
(-3又2/3)-(-2又3/4)-(-7又2/3)-(+2.75)
(-1)-(+1又1/2)-(-2又1/4)-2 展开
(-32)-(-12)-5-(-15)
(-3又2/3)-(-2又3/4)-(-7又2/3)-(+2.75)
(-1)-(+1又1/2)-(-2又1/4)-2 展开
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