+5→-5=a
-4→-+4=b
-(-3)→+3→-3=c
-8→+8=d
a-b+c-d=-5-4+(-3)-8=-20
設+5,-4,-(-3),-8的相反數分別為a,b,c,d則a-b+c-d=?(..-阿摩線上測驗
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