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pemuoilovely_2408
2 năm trước
Giups nha các thiên tài Bài 1:CMR $\frac{1}{2 ² }$ + $\frac{1}{3²}$ +..............+ $\frac{1}{100²}$ <1 Bài 2: tìm số tn x a,($\frac{1}{1.2.3}$ +$\frac{1}{2.3.4}$ +..............+$\frac{1}{8.9.10}$ ).x=$\frac{23}{45}$ b, $\frac{30}{43}$ =$\frac{1}{a+\frac{1}{b+\frac{1}{c+\frac{1}{d}
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