Câu 1 sai đề nha bạn
92 × 4 - 27 = a + $\dfrac{350}{a}$ + 315
368 - 27 = a + 350 : a + 315
341 = a + 350 : a + 315
a + 350 : a + 315 = 341
a + 350 : a = 341 - 315
a + 350 : a = 26
a + 350 = 26 × a
a × 26 - a = 350
a × ( 26 - 1 ) = 350
a × 25 = 350
a = 350 : 25
a = 14