Câu hỏi của Vũ Ngọc Ánh

Question

tính : 1/1x2+1/2x3+1/3x4+1/4x5+1/5x6

Hiền Thương · Accepted Answer

$\frac{1}{1\cdot2}+\frac{1}{2\cdot3}+\frac{1}{3\cdot4}+\frac{1}{4\cdot5}+\frac{1}{5\cdot6}$$=\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}$$=\frac{1}{1}-\frac{1}{6}$$=\frac{5}{6}$Câu trả lời: $\frac{1}{1\cdot2}+\frac{1}{2\cdot3}+\frac{1}{3\cdot4}+\frac{1}{4\cdot5}+\frac{1}{5\cdot6}$$=\frac{1}{1}-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}$$=\frac{1}{1}-\frac{1}{6}$$=\frac{5}{6}$

Lê Minh Vũ · Answer

$\frac{1}{1.2}$$+$$\frac{1}{2.3}$$+$$\frac{1}{3.4}$$+$$\frac{1}{4.5}$$+$$\frac{1}{5.6}$$=$$\frac{1}{1}$$-$$\frac{1}{2}$$+$$\frac{1}{2}$$-$$\frac{1}{3}$$+$$\frac{1}{3}$$-$$\frac{1}{4}$$+$$\frac{1}{4}$$-$$\frac{1}{5}$$+$$\frac{1}{5}$$-$$\frac{1}{6}$$=$$\frac{1}{1}$$-$$\frac{1}{6}$$=$$\frac{5}{6}$Hok tốtCâu trả lời: $\frac{1}{1.2}$$+$$\frac{1}{2.3}$$+$$\frac{1}{3.4}$$+$$\frac{1}{4.5}$$+$$\frac{1}{5.6}$$=$$\frac{1}{1}$$-$$\frac{1}{2}$$+$$\frac{1}{2}$$-$$\frac{1}{3}$$+$$\frac{1}{3}$$-$$\frac{1}{4}$$+$$\frac{1}{4}$$-$$\frac{1}{5}$$+$$\frac{1}{5}$$-$$\frac{1}{6}$$=$$\frac{1}{1}$$-$$\frac{1}{6}$$=$$\frac{5}{6}$Hok tốt

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