Toán Lớp 6: Bài 1 :
a) (-12)-(-27)
b) (-5)-(+8)
c) 19-[15-(-6)]
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Toán Lớp 6: Bài 1 :
a) (-12)-(-27)
b) (-5)-(+8)
c) 19-[15-(-6)]
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