Tìm x, biết: a) x : (-1/2)^3 = -1/2; b) x . (3/5)^7 = (3/5)^9;

a) x:−123=−12x:−1323=−12x:−18=−12x=−12.−18x=116

Vậy x=116

b) x.357=359x=359:357x=359−7x=352=925Vậy x=925

c) −2311:x=−239x=−2311:−239x=−2311−9x=−232=49Vậy x=49

d) x.0,256=148x.146=148x=148:146x=148−6x=142=116Vậy x=116