Toán Lớp 6: Tìm x biết :
a) 2/3 ( x – 1) – 4/5 ( 3 – 2x ) = x + 9
b) x – 1/12 = 75/x – 1
c) 7^x – 1 + 7^x + 1 – 7^x . 2 = 1764
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Toán Lớp 6: Tìm x biết :
a) 2/3 ( x – 1) – 4/5 ( 3 – 2x ) = x + 9
b) x – 1/12 = 75/x – 1
c) 7^x – 1 + 7^x + 1 – 7^x . 2 = 1764
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