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統計: A(15), B(28), C(22), D(407), E(0) #296437
統計: A(15), B(28), C(22), D(407), E(0) #296437
詳解 (共 1 筆)
#947366
a-2b=(2-2*3,1-(2*-4)
=(2-6,1-(-8))
=(-4,9)
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