Câu hỏi của Phạm Nguyễn Khánh Huyền

Question

tính nhanh giá trị biểu thức

Teen · Accepted Answer

$45^2+40^2-10^2+80.45$

$=\left(45+40\right)^2-10^2$

$=\left(45+40-10\right)\left(45+40+10\right)$

$=75.95=7125$

Câu trả lời:

$45^2+40^2-10^2+80.45$

$=\left(45+40\right)^2-10^2$

$=\left(45+40-10\right)\left(45+40+10\right)$

$=75.95=7125$

Teen · Answer

$3\left(2^2+1\right)\left(2^4+1\right)\left(2^8+1\right)\left(2^{16}+1\right)$

$=\left(2^2-1\right)\left(2^2+1\right)\left(2^4+1\right)\left(2^8+1\right)\left(2^{16}+1\right)$

$=\left(2^4-1\right)\left(2^4+1\right)\left(2^8+1\right)\left(2^{16}+1\right)$

$=\left(2^8-1\right)\left(2^8+1\right)\left(2^{16}+1\right)$

$=\left(2^{16}-1\right)\left(2^{16}+1\right)$