Răspuns:
Explicație pas cu pas:
√49*169 = 7*13 = 91
7√81 = 7*9 = 63
√49 = 7
√576 = 24
√(1521/64) = 39/8
(2/3)^2 = 4/9
√(729/100) = 27/10
________
(91 - 63)/(24 + 24*39/8) = 7x / 4/9 * 27/10
28 / (24 + 3*39) = 7x / (6/5)
28/141 = 35x/6
x = 28*6/141*35 = 24/705 = 8/235
