题目−712-\frac{7}{12}−127的相反数是（ ）A.712\frac{7}{12}127B.−712-\frac{7}{12}−127C.127\frac{12}{7}712D.−127-\frac{12}{7}−712知识点：解二元一次方程组——代入消元法章节：未标注
