\(\frac{458.75-374}{72.458+1000}=\frac{458.72+458.3-374}{458.72+1000}=\frac{458.72+1374-372}{458.72+1000}=\frac{458.72+1000}{458.72+1000}=1\)

sai đề nha 75 sao trừ được 375

33976;33976

x = 505

\(\frac{34}{43}=\frac{374}{x-32}\)

\(\Rightarrow34\left(x-32\right)=43x374\)

\(\Rightarrow34x-1088=16082\)

\(\Rightarrow34x=16082+1088=17170\)

\(\Rightarrow x=\frac{17170}{34}=505\)

34/43=374/x-32

43.374=34(x-32)

16082=34x-1088

34x=16082-1088

34x=17170

x=505

cai bai nay minh thay

quen quen nhung lai ko nghi ra

chu!

chuc bn hoc gioi1

Ta có : \(\frac{1}{1000}+\frac{13}{1000}+\frac{25}{1000}+.....+\frac{85}{1000}+\frac{97}{1000}\)

\(=\frac{1+13+25+......+85+97}{1000}\)

\(=\frac{441}{1000}\)

de bai sai tham nao khong lam gia 

\(\frac{1}{1000}+\frac{13}{1000}+\frac{25}{1000}+...+\frac{97}{1000}+\frac{109}{1000}\)

\(=\frac{1+13+25+...+97+109\left(9số\right)}{1000}\)

\(=\frac{\left(109+1\right).9:2}{1000}=\frac{495}{1000}=\frac{99}{200}\)

Bằn 11/20 nhé chúc bạn học tốt

     \(\frac{1}{1000}+\frac{13}{1000}+\frac{25}{1000}+...+\frac{97}{1000}+\frac{109}{1000}\)

\(=\frac{\left(1+13+25+...+97+109\right)}{1000}\)

\(=\frac{\left(109+1\right)\times\left[\left(109-1\right):12+1\right]:2}{1000}\)

\(=\frac{110\times10:2}{100}\)

\(=\frac{550}{100}\)

\(=5\frac{1}{2}\)

đây là toán lớp 5 hả