\(364-5\cdot\left(4x+7\right)=269\\ 5\cdot\left(\text{4x+7}\right)=364-269\\ 5\cdot\left(4x+7\right)=95\\ 4x+7=95:5\\ 4x+7=19\\ 4x=19-7\\ 4x=12\\ x=\dfrac{12}{4}\\ x=3\)

B3

\(a.\left(x-25\right)-175=0\\ x-\left(25+175\right)=0\\ x-200=0\\ x=200\\ b.315+\left(135-x\right)=450\\ \left(315+135\right)-x=450\\ 500-x=450\\ x=500-450\\ x=50\\ c.346+\left(210-x\right)=556\\ \left(346+210\right)-x=556\\ 556-x=556\\ x=0\\ d.x\cdot14-x\cdot2=120\\ x\cdot12=120\\ x=120:12\\ x=10\\ e,x\cdot5+10\cdot9=990\\ x\cdot5+90=990\\ x\cdot5=990-90\\ x\cdot5=900\\ x=900:5\\ x=180\\ f.x\cdot34-x\cdot14=200\\ x\cdot20=200\\ x=200:20\\ x=10\)

Theo thứ tự từ lớn đến bé:\(\dfrac{17}{15};1;\dfrac{5}{12};0;\dfrac{2}{-10};-\dfrac{19}{19};-\dfrac{10}{8}\)

Theo thứ tự từ bé đến lớn : \(-\dfrac{3}{4};-\dfrac{7}{12};-\dfrac{5}{12};-\dfrac{1}{3};\dfrac{1}{-4}\)

3⁷ . 27⁵ . 81³​

= 3⁷ . (3³)⁵ . (3⁴)³

= 3⁷ . 3¹⁵ . 3¹²

= 3³⁴