a) 773773

b) 13

c) -56

Tìm x hay tính bạn ????

??? đề j kì vậy?

a, 18^3 : 9^3 = 5832 : 729 = 8

a) 18^3 _:  9 ³ = ( 18 : 9 ) ³ = 2³ = 8

b) 125³ : 25³ = 5³ = 125

4¹⁸ : 4¹⁵ - 2 . 2⁴ = 4^{18 - 15} - 2^{1 + 4}

= 4³ - 2⁵

= 64 - 32

= 32

4\(^{18}\):4\(^{15}\)-2.2\(^4\) = 32

\(A=18^{15}-\frac{8^5.9^{14}.5}{4^8}.27^{10}-4^7.3^{31}=\left(2.3^2\right)^{15}-\frac{\left(2^3\right)^5.\left(3^2\right)^{14}.5}{\left(2^2\right)^8}.\left(3^3\right)^{10}-\left(2^2\right)^7.3^{31}\)

\(=2^{15}.3^{30}-\frac{2^{15}.3^{28}.5}{2^{16}}.3^{30}-2^{14}.3^{31}\)

\(=2^{15}.3^{30}-\frac{3^{58}.5}{2}-2^{14}.3^{31}\)

\(=2^{14}.3^{30}\left(2-3\right)-\frac{3^{58}.5}{2}=-1.2^{14}.3^{30}-\frac{3^{58}.5}{2}=-1.2^{15}.3^{30}-3^{58}.5\)

\(=3^{30}\left(-1.2^{15}-3^{28}.5\right)\)

a) \(\left[\left(10-2.30.5\right)+2.6\right]:2+\left(4.5\right)^2\)

\(=\left[\left(10-300\right)+2.6\right]:2+20^2\)

\(=\left(-290+2.6\right):2+400\)

\(=\left(-290+12\right):2+400\)

\(=-278:2+400\)

\(=-139+400\)

\(=-\left(139-400\right)\)

\(=-\left(-261\right)\)

\(=261\)

b) \(536.27-9\left(825+219\right):18+15^3:15^2.4^2.3\)

\(=536.27-9.1044:18+15^3:15^2.4^2.3\)

\(=14472-9396:18+15^3:15^2.4^2.3\)

\(=14472-522+15^3:15^2.4^2.3\)

\(=13920+15^{3-2}.4^2.3\)

\(=13920+15.4^2.3\)

\(=13920+15.16.3\)

\(=13920+240.3\)

\(=13920+720\)

\(=14640\)