Question

10•{4^2•4^6:4^5-3•[7•7^4:7^3-(5^2)^5:5^8-3]}

Answer 1

10•{4^2•4^6:4^5-3•[7•7^4:7^3-(5^2)^5:5^8-3]}
=10•[4^2•4^6:4^5-3•(7•7^4:7^3-5^10:5^8-3)]
=10•[4^2•4^6:4^5-3•(7^2-5^2-3)]
=10•(4^2•4^6:4^5-3•21)
=10•(4^3-63)
=10•(72)
=720