4^30=2^30*2^30

=2^30*4^15

3*24^10=3*3^10*8^10=3^11*2^30

mà 4^30>3^11

nên 2^30+3^30+4^30>3*24^10

Ta có: 4^30=2^30.2^30=2^30.4^15

3.24^10=3.(3.2^3)^10=2^30.3^11

Ta thấy: 3^11<3^15<4^15 => 4^15>3^11

Vì 4^15>3^11 nên 2^30.4^15>2^30.3^11

=>2^30+3^30+4^30>3.24^10

\(3\times24^{10}\)

\(=3\times\left(2^3\times3\right)^{10}\)

\(=3\times3^{10}\times\left(2^3\right)^{10}\)

\(=3^{11}\times2^{30}\)

\(=3^{11}\times\left(2^2\right)^{15}\)

\(=3^{11}\times4^{15}\)

Vì \(3^{11}\)<\(4^{15}\left(3;4;11;15\inℕ\right)\)

Nên \(3^{11}\times4^{15}\)< \(4^{15}\times4^{15}=4^{30}\)

Do đó : \(3\times24^{10}\)< \(4^{30}\)

Vậy \(2^{30}+3^{30}+4^{30}\)> \(3\times24^{10}\)

Ta có : 3.24^10=3.(3.2^3)^10=3^11.2^30=3^11.4^15<4^15.4^15=4^30

⇒2^30+3^30+4^30>3.24^10

4^30=2^30*2^30

=2^30*4^15

3*24^10=3*3^10*8^10=3^11*2^30

mà 4^30>3^11

nên 2^30+3^30+4^30>3*24^10

4^30=2^30*2^30

=2^30*4^15

3*24^10=3*3^10*8^10=3^11*2^30

mà 4^30>3^11

nên 2^30+3^30+4^30>3*24^10

Tính từ máy tính casio fx 570 es plus hoặc fx 570 vn plus

Ta thu đc kết quả:

A>B

Ta có: \(4^{30}=2^{30}.2^{30}=\left(2^3\right)^{10}.\left(2^2\right)^{15}=8^{10}.4^{15}>8^{10}.3^{15}>8^{10}.3^{11}\) (1)

Mà  \(8^{10}.3^{11}=8^{10}.3^{10}.3=\left(8.3\right)^{10}.3=24^{10}.3\)  (2)

Từ (1);(2)=> \(4^{30}>3.24^{10}\)

Vậy \(2^{30}+3^{30}+4^{30}>3.24^{10}\)