Toán Lớp 6: Cho B= 23! + 19! – 15! . Chứng minh rằng :
a, B : 11
b, B : 110
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Toán Lớp 6: Cho B= 23! + 19! – 15! . Chứng minh rằng :
a, B : 11
b, B : 110
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