Câu hỏi của hung le

Question

B=5/1*6+5/6*4+...+5/101*106

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Huỳnh Bá Nhật Minh · Accepted Answer

$\frac{5}{1\cdot6}+\frac{5}{6\cdot11}+...+\frac{5}{101\cdot106}$

$=\frac{1}{1\cdot6}+\frac{1}{6\cdot11}+...+\frac{1}{101\cdot106}$

$=\frac{1}{1}-\frac{1}{6}+\frac{1}{6}-\frac{1}{11}+...+\frac{1}{101}-\frac{1}{106}$

$=\frac{1}{1}-\frac{1}{106}$

$=\frac{106}{106}-\frac{1}{106}$

$=\frac{105}{106}$

Câu trả lời:

$\frac{5}{1\cdot6}+\frac{5}{6\cdot11}+...+\frac{5}{101\cdot106}$

$=\frac{1}{1\cdot6}+\frac{1}{6\cdot11}+...+\frac{1}{101\cdot106}$

$=\frac{1}{1}-\frac{1}{6}+\frac{1}{6}-\frac{1}{11}+...+\frac{1}{101}-\frac{1}{106}$

$=\frac{1}{1}-\frac{1}{106}$

$=\frac{106}{106}-\frac{1}{106}$

$=\frac{105}{106}$

The King · Answer

Đề sai nha bn

$B=\frac{5}{1.6}+\frac{5}{6.11}+...+\frac{5}{101.106}$

$B=\frac{6-1}{1.6}+\frac{11-6}{6.11}+...+\frac{106-101}{101.106}$

$B=1-\frac{1}{6}+\frac{1}{6}-\frac{1}{11}+...+\frac{1}{101}-\frac{1}{106}$

$B=1-\frac{1}{106}=\frac{106}{106}-\frac{1}{106}=\frac{105}{106}$