\(\frac{0,8.0,04.1,25.25+0,6524+0,3476}{10.125.4.25.8}\)

\(=\frac{\left(0,8.1,25\right).\left(0,04.25\right)+\left(0,6524+0,3476\right)}{10.\left(125.8\right).\left(25.4\right)}\)

\(=\frac{1.1+1}{10.1000.100}\)

\(=\frac{1}{500000}\)

nếu mà ra phân số thì mình tính là \(\frac{2}{1000000}\)

nếu mà mình lấy 2:1000000=0,000002

chưa chắc là mình tính đúng đâu bạn nhớ tính lại nhé

chú bạn học giỏi nha

\(A=\frac{5+55+555+5555}{9+99+999+9999}=\frac{5.\left(1+11+111+1111\right)}{9.\left(1+11+111+1111\right)}=\frac{5}{9}\)

Tớ làm luôn

A=\(\frac{5.\left(1+11+111+1111\right)}{9.\left(1+11+111+1111\right)}\)

A=\(\frac{5}{9}\)

\(A=\frac{\left(5.1+5.11+5.111+5.1111\right)}{9.1+9.11+9.111+9.1111}\)

\(A=\frac{5.\left(1+11+111+1111\right)}{9.\left(1+11+111+1111\right)}\)

\(\Rightarrow A=\frac{5}{9}\)

Chúc em học tốt^^

\(\frac{5+55+555+5555}{9+99+999+9999}=\frac{5.\left(1+11+111+1111\right)}{9.\left(1+11+111+1111\right)}=\frac{5}{9}\)\(\frac{5}{9}\)

dấu chấm bạn cứ hiểu là nhân nhé !

\(\frac{5+55+555+5555}{9+99+999+9999}=\frac{5+11x5+111x5+1111x5}{9+11x9+111x9+1111x9}\)\(=\frac{5x5x5x5}{9x9x9x9}=\frac{625}{6561}\)

A = \(\frac{6170}{11106}=\frac{5}{9}\)

chịu

Gọi \(A=\frac{1}{1.4}+\frac{1}{4.7}+\frac{1}{7.10}+...+\frac{1}{22.25}\)

\(\Leftrightarrow\)\(3A=\frac{3}{1.4}+\frac{3}{4.7}+\frac{3}{7.10}+...+\frac{3}{22.25}\)

\(\Leftrightarrow\)\(3A=\frac{1}{1}-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}+...+\frac{1}{22}-\frac{1}{25}\)

\(\Leftrightarrow\)\(3A=1-\frac{1}{25}\)

\(\Leftrightarrow\)\(3A=\frac{24}{25}\)

\(\Leftrightarrow\)\(A=\frac{24}{25}:3\)

\(\Leftrightarrow\)\(A=\frac{24}{25}.\frac{1}{3}\)

\(\Leftrightarrow\)\(A=\frac{8}{25}\)

Vậy \(A=\frac{8}{25}\)

Đặt \(C=\frac{1}{1.4}+\frac{1}{4.7}+...+\frac{1}{22.25}\)

\(\Rightarrow3C=\frac{3}{1.4}+\frac{3}{4.7}+\frac{3}{7.10}+....+\frac{3}{22.25}\)

\(\Rightarrow3C=1-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}+...+\frac{1}{22}-\frac{1}{25}\)

\(\Rightarrow3C=1-\frac{1}{25}=\frac{24}{25}\)

\(\Rightarrow C=\frac{24}{25}:3=\frac{8}{25}\)

Vậy \(\frac{1}{1.4}+\frac{1}{4.7}+...+\frac{1}{22.25}=\frac{8}{24}\)

e)\(\frac{0,1997+2,5\cdot12,5\cdot0,4\cdot0,08+8,003}{1,25\cdot2,5\cdot8\cdot4}=\frac{0,1997+1+8,003}{100}=\frac{2}{100}=\frac{1}{50}\)

g)\(\frac{\left(10,6524+0,3476\right)\cdot125\cdot0,4+8}{4\cdot0,1\cdot8\cdot0,25\cdot125}=\frac{11\cdot125\cdot0,4+8}{100}=\frac{558}{100}=5,58\)

Mk bó tay, chân.

Bạn ''Nguyễn Tiến Dũng'' làm đúng ròi đó.

Hok tốt !

=\(\frac{5}{9}\)

\(\frac{5+55+555+5555}{9+99+999+9999}=\frac{5.\left(1+11+111+1111\right)}{9.\left(1+11+111+1111\right)}=\frac{5}{9}\)

bực quá đúng là bất công vừa làm bài , vừa đăng bài giups cuối cùng chẳng được gì

Câu 1 : \(1,321338308x10^{-4}\)

Câu 2 : \(1316,572106\)

Câu 3 : \(1,641302619x10^{-13}\)

Ủng hộ nhé,tớ đang âm.

mấy câu này dễ

\(\frac{5+55+555+5555}{9+99+999+9999}=\)

\(=\frac{5x\left(1+11+111+1111\right)}{9x\left(1+11+111+1111\right)}=\frac{5}{9}\)