Câu hỏi của Nguyễn văn a

Question

Tính nhanh :

a . 473 + 9 . 472 + 27 . 47 + 27

b . 1023 - 6 . 1022 + 12 . 102 - 8

Nguyễn Việt Lâm · Accepted Answer

a/ $=47^3+3.47^2.3+3.47.3^2+3^3$

$=\left(47+3\right)^3=50^3=125000$

b/ $=102^3-3.102^2.2+3.102.2^2-2^3$

$=\left(102-2\right)^3=100^3=1000000$Câu trả lời: a/ $=47^3+3.47^2.3+3.47.3^2+3^3$

$=\left(47+3\right)^3=50^3=125000$

b/ $=102^3-3.102^2.2+3.102.2^2-2^3$

$=\left(102-2\right)^3=100^3=1000000$