Question

A=3/1*4 + 3/4*7 + 3/7*10 +...+ 3/ 37*100

giúp mk nha mn ai nhanh mk tik cho

Answer 1

\(A=\frac{3}{1.4}+\frac{3}{4.7}+...+\frac{3}{97.100}\)

\(\Rightarrow A=1-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+...+\frac{1}{97}-\frac{1}{100}\)

\(\Rightarrow A=1-\frac{1}{100}=\frac{99}{100}\)

Answer 2

\(A=\frac{3}{1.4}+\frac{3}{4.7}+\frac{3}{7.10}+...+\frac{3}{97.100}\)

\(A=1-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}+...+\frac{1}{97}-\frac{1}{100}\)

\(A=1-\frac{1}{100}\)

\(A=\frac{99}{100}\)

Vậy\(A=\frac{99}{100}\)