Tính biểu thức

To solve the equations, we need to find the values of u9, u4, u3, and u8.

From the equation u9 - u4 = 15, we can rearrange it to u9 = u4 + 15.

From the equation u3 * u8 = 184, we can rearrange it to u8 = 184/u3.

Substituting the value of u8 in terms of u3 into the equation u9 = u4 + 15, we get u9 = u4 + 15 = 184/u3.

Now, we have two equations:

u9 = 184/u3
u9 = u4 + 15

Since both equations are equal to u9, we can set them equal to each other:

184/u3 = u4 + 15

To solve for u3, we can rearrange the equation:

184 = u3(u4 + 15)

Now, we have an equation with two variables, u3 and u4. We need more information to solve for the specific values of u3 and u4.