a) 2412787

b) 55543

235400

235400

= 2354 x (125 - 25)
= 2354 x 100
= 235400

98775 - 32 x 85

=98775 -2720

=96055

 67500 - 24 x 236

= 67500 -5664

=61836

 568 + 101598 : 287

= 568 +354

=922

6875 + 980 -180  

=7855 -180 

=7675

\(\dfrac{2}{5}+\dfrac{3}{10}-\dfrac{1}{2}\)

\(=\dfrac{7}{10}-\dfrac{1}{2}\)

= \(\dfrac{1}{5}\)

\(\dfrac{8}{11}+\dfrac{8}{33}x\dfrac{3}{4}\)

\(=\dfrac{8}{11}+\dfrac{2}{11}\)

\(=\dfrac{10}{11}\)

\(\dfrac{7}{9}x\dfrac{3}{14}:\dfrac{5}{8}\)

\(=\dfrac{1}{6}:\dfrac{5}{8}\)

\(=\dfrac{1}{6}x\dfrac{8}{5}\)

\(=\dfrac{8}{30}\)

\(=\dfrac{4}{15}\)

\(\dfrac{5}{12}-\dfrac{7}{32}:\dfrac{21}{16}\)

\(=\dfrac{5}{12}-\dfrac{7}{32}x\dfrac{16}{21}\)

\(=\dfrac{5}{12}-\dfrac{1}{6}\)

\(=\dfrac{5}{12}-\dfrac{2}{12}\)

\(=\dfrac{3}{12}=\dfrac{1}{4}\)

_{Tín hịu cầu kíu :>>}

2,75; 2,79

10,476; 10,478

\(2,7< 2,71< 2,8\)

\(10,47< 10,471< 10,48\)

b: \(x\in\left\{2.71;2.75\right\}\)

c: \(x\in\left\{10.475;10.476\right\}\)

x + 3426 = 5689

x            = 5689 - 3426

x            = 2263

k cho mk nhé,kb luôn

x + 3426 = 5689

x            = 5689 - 3426

x            = 2263

x + 3426 = 5689

x             = 5689 - 3426

x             = 2263

thiếu yêu cầu ạ tìm x để `(x+3)/(x+1) là số nguyên hay j ạ 

thiet yếu là cần số nguyên nha

giúp em đi mn ơi

a: ĐKXĐ: x<>1; x<>-1

b: \(B=\dfrac{x^2+2x+1-x^2+2x-1}{\left(x+1\right)\left(x-1\right)}:\dfrac{2-x^2-x+x-1}{\left(x-1\right)\left(x+1\right)}\)

\(=\dfrac{4x}{-x^2+1}\)

\(\dfrac{7}{9}< \dfrac{x}{y}< \dfrac{7}{8}\)

\(\dfrac{56}{72}< \dfrac{x}{y}< \dfrac{63}{72}\)

\(\dfrac{x}{y}=\left\{\dfrac{57}{72};\dfrac{58}{72};\dfrac{59}{72};\dfrac{60}{72};\dfrac{61}{72};\dfrac{62}{72}\right\}\)