Toán Lớp 11: Tìm tất cả các giá trị x \in NN thoả mãn:
a,6(P_x – P_{x-1} )=P_{x+1}
b, 3A_x^4 = 24 (A_{x+1} ^3 – C_x ^{x-4})
c, 3A_2 ^x – A_2 ^{2x} +42=0
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Toán Lớp 11: Tìm tất cả các giá trị x \in NN thoả mãn:
a,6(P_x – P_{x-1} )=P_{x+1}
b, 3A_x^4 = 24 (A_{x+1} ^3 – C_x ^{x-4})
c, 3A_2 ^x – A_2 ^{2x} +42=0
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