Question

[NGUYỄN HOÀNG BẢO TRÂN]

Tính nhanh :

a/362 + 262 - 52.36

b/993 + 1 + 3(992 + 99)

Answer 1

[Nguyễn Lê Phước Thịnh]

a: \(36^2+26^2-52\cdot36=\left(36-26\right)^2=10^2=100\)

b: \(99^3+1+3\left(99^2+99\right)\)

\(=\left(99+1\right)^3-3\cdot99\cdot1\cdot\left(99+1\right)+3\left(99^2+99\right)\)

=100^3=10^6