=>(x-347)x a=a x 111

chia cả 2 vế cho a ta được:

x-347=111

=>x=458

52 ÷ x +8 ÷ x=5

457 x 67 = 

 đáp án là  30 619

hok tốt 

= 30619

HT

\(154\cdot10=1540\)

154 x 10 = 1540

\(x+\left[\frac{5}{5}+\frac{5}{45}+\frac{5}{117}+\frac{5}{221}+...+\frac{5}{1845}\right]=2\)

\(x+\left[\frac{5}{1.5}+\frac{5}{5.9}+\frac{5}{9.13}+\frac{5}{13.17}+...+\frac{5}{41.45}\right]=2\)

\(\frac{5}{4}x+\frac{5}{4}.\left(\frac{4}{1.5}+\frac{4}{5.9}+\frac{4}{9.13}+\frac{4}{13.17}+...+\frac{4}{41.45}\right)=\frac{2.5}{4}=\frac{5}{2}\)

\(\frac{5}{4}x+\frac{5}{4}.\left(1-\frac{1}{45}\right)=\frac{5}{2}\)

\(\frac{5}{4}x+\frac{11}{9}=\frac{5}{2}\)

\(\frac{5}{4}x=\frac{23}{18}\)

\(x=\frac{46}{45}\)

= (725 x 91) + (275 x 91)

=65 975 + 25 025

= 91 000 

bài này tự tạo à

=\(\frac{2001x2004x1001x2006}{2004x2006x2001x2002}\)=\(\frac{1}{2}\)

\(=\frac{2001.2004.1001.2002}{2004.2006.2001.2002}=\frac{1.1.1001.1}{1.2006.1.1}=\frac{1001}{2006}\)

\(\frac{3}{4}\)và \(\frac{4}{5}\)MSC 20 

\(\frac{3}{4}=\frac{3\times5}{4\times5}=\frac{15}{20}\)

\(\frac{4}{5}=\frac{4\times4}{5\times4}=\frac{16}{20}\)

\(\frac{16}{20}>\frac{15}{20}\)

Vậy \(\frac{4}{5}>\frac{3}{4}\)

3/4 <4/5

\(x-\frac{1}{4}=\frac{3}{5}\)

\(x=\frac{3}{5}+\frac{1}{4}\)

\(x=\frac{12}{20}+\frac{5}{20}\)

\(x=\frac{17}{20}\)

\(x:\frac{2}{3}=\frac{1}{2}\)

\(x=\frac{1}{2}.\frac{2}{3}\)

\(x=\frac{1}{3}\)

Hok tốt

\(x-\frac{1}{4}=\frac{3}{5}\)

\(x\)        \(=\frac{3}{5}+\frac{1}{4}\)

\(x\)          \(=\frac{12}{20}+\frac{5}{20}\)

\(x\)           \(=\frac{17}{20}\)

\(x:\frac{2}{3}=\frac{1}{2}\)

\(x\)    \(=\frac{1}{2}x\frac{2}{3}\)

\(x\)     \(=\frac{2}{6}\)rút gọn \(\frac{1}{3}\)

Các bạn ơi giúp mik đi, mik chỉ còn 15 phút thôi là mik phải nộp bài, các bn giúp mik nha