1.tìm x , bt : ( 1/6 + 1/12 + ... + 1/72 + 1/90 ) . x = 1/5 2. tính 1^2/1.2 x 2^2/ 2.3 x 3^2/3.4 x 4^2/4.5

1.tìm x , bt : ( 1/6 + 1/12 + ... + 1/72 + 1/90 ) . x = 1/5 2. tính 1^2/1.2 x 2^2/ 2.3 x 3^2/3.4 x 4^2/4.5
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