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統計: A(10), B(90), C(25), D(15), E(0) #296474
統計: A(10), B(90), C(25), D(15), E(0) #296474
詳解 (共 1 筆)
#985352
原式=[(√3)/2]^2 +[ (√2)/2]^2 + [ (√3)/3]^2
=19/12
選B
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