\(45^2+40^2-10^2+80.45\)

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

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

\(=75.95=7125\)

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

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

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

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

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

\(=\left(2^{32}-1\right)\)

45² +40²-15²+80.45

=> 45²+80.45+40²-15²

=> (45+40)²-15²

=> 85²-15²

=> (85-15)(85+15)

=> 70.100

=>7000

(-15)\(x\) = - 45

       \(x\)  = - 45 : (-15)

      \(x\)  = 3

Vậy \(x=3\)

(-15)\(x\) = 10.(-40).(-5)

    -15\(x\)  =  -400.(-5)

   -15\(x\)   = 2000

    \(x\)   = 2000 : (-15)

    \(x\)  = - \(\dfrac{400}{3}\)

Vậy \(x=-\dfrac{400}{3}\) 

(+2).\(x\)  = - 16

      \(x\)   = -16 : (2)

      \(x\)  = - 8

Vậy \(x=-8\)

Ta có : 45² + 40² - 15² + 80.45

         = ( 45² + 80.45 + 40² ) - 15²

        = ( 45 + 40 )² - 15²

       = ( 45 + 40 - 15 )( 45 + 40 + 15 )

       = 70 . 100 = 7000

\(45^2+40^2-15^2+80.45\)

\(=40^2+2.40.45+45^2-15^2\)

\(=\left(40+45\right)^2-15^2\)

\(=\left(40+45-15\right)\left(40+45+15\right)\)

\(=70.100=7000\)

\(45^2+40^2-15^2+80.45\) \(=3400+3600\)

                                                           \(=7000\)

Tk mình nhé.

\(=\left(45+40\right)^2-15^2\)

\(=85^2-12^2\)

\(=\left(85-15\right)\left(85+15\right)\)

\(=70.100=7000\)

45^2+40^-15^2+80*45

=45*45+(40+15)(40-15)+80*45

=45*45+55*25+80*45

=45(45+80)+55*25

=45*125+55*25

=45*25*5+55*25

=225*25+55*25

=(225+55)*25

=280*25

=7000

45² + 40² - 15² + 80.45

= 45² + 2.40.45 + 40² - 15²

= (45 +40)² - 15²

= (85- 15)(85 + 15 )

=70.100

=7000

hỏi chi mà nhiều :)

\(=45^2+2\cdot45\cdot40+40^2-15^2\)

\(=85^2-15^2\)

\(=70\cdot100=7000\)

=3243375 nhé bạn

** mmk nha

sử dụng hằng đẳng thức 1 và 3 kết quả là 40000