\(129+291+284+298+292+896\)

\(=\left(129+291\right)+\left(284+896\right)+\left(298+292\right)\)

\(=420+1180+590\)

\(=1600+590\)

\(=2190\)

\(120+130+140+150+160+170+180+190\)

\(=\left(120+180\right)+\left(130+170\right)+\left(140+160\right)+\left(150+190\right)\)

\(=300+300+300+340\)

\(=1240\)

\(\sqrt{4x-5}=\sqrt{3}\left(ĐKXĐ:x\ge\dfrac{5}{4}\right)\)

\(\Rightarrow4x-5=3\)

\(\Leftrightarrow4x=8\)

\(\Leftrightarrow x=2\left(tm\right)\)

Vậy \(S=\left\{2\right\}\)

\(579\times y+421\times y=2100\)

\(\left(579+421\right)\times y=2100\)

\(1000\times y=2100\)

\(y=2100:1000\)

\(y=2,1\)

z hả bà, cố gắng thi tốt nhen

tui thi gần xg r bà ơi, mai thi nốt môn cuối là môn toán là xg á bà, trg bà thi chậm dữ

D