a)\(\left(153+47\right)^2\)

b)\(\left(126-76\right)^2\)

c)\(15^8-15^8+1=1\)

A: \(135^2+94\cdot153+47^2=135^2\cdot2\cdot47+153\cdot47\)

\(=47\left(36450+153\right)=36603\cdot47=1720341\)

B: \(126^2-152\cdot126+5776=126^2-2\cdot126\cdot76+76^2=\left(126-76\right)^2=50^2=2500\)

C: \(3^8\cdot5^8-\left(15^4-1\right)\left(15^4+1\right)=15^8-\left(15^8-1\right)=15^8-15^8+1=1\)

Tính nhanh:
a)       

153^2 + 94 * 153 + 47^2
= 153 * (153 + 94) + 47^2
= 153 * 247 + 47^2
= 153 * (200 + 47) + 47^2
= 153 * 200 + 153 * 47 + 47^2
= 153 * 200 + 47 * (153 + 47)
= 153 * 200 + 47 * 200

= 200 * (153 + 47)
= 200 * 200
= 40000

b)126^2 - 152.126 + 5776
= 126 . 126 - 152.126 +126. 2888/63
= 126 . ( 126 - 152 + 2888/63)
= 126 . 1250/63
= 2500

Câu c bn tự làm nha

a) \(153^2+94.153+47^2=153^2+2.47.153+47^2\)

\(=\left(153+47\right)^2=200^2=40000\)

b) \(126^2-152.126+5776=126^2-2.76.126+76^2\)

\(=\left(126-76\right)^2=50^2=2500\)

c) \(3^8.5^8-\left(15^4-1\right)\left(15^4+1\right)=15^8-\left[\left(15^4\right)^2-1\right]\)

\(=15^8-\left(15^8-1\right)=15^8-15^8+1=1\)

Tính nhanh :

126² - 152 x 126 + 5776

= 126 x 126 - 152 x 126 + 5776

= 126(126-152) + 5776

= -3276 + 5776

= 2500

\(126^2-152.126+5776\)

\(=126.126-152.126+5776\)

\(=126.\left(126-152\right)+5776\)

\(=126.\left(-26\right)+5776\)

\(=\left(-3276\right)+5776\)

\(=2500\)

\(126^2-152.126+5776\)

\(=126.126-152.126+5776\)

\(=126.\left(126-152\right)+5776\)

\(=126.\left(-26\right)+5776\)

\(=-3276+5776\)

\(=2500\)

Rất vui vì giúp đc bạn <3

`a, 126^2 - 152 . 126 + 5776.`

`= 126^2 - 2 . 76 . 126 + 76^2`

`= (126+76)^2 = 202^2 = 40804`

`b, 3^8 . 5^8 - (15^4-1)(15^4+1)`

`= 15^8 - 15^8 + 1`

`= 1`

Ta có: 126²=126.126=(123+3).126=123.126+3.126=123.126+378

           123.129= 123.(126+3)=123.126+123.3=123.126+369

       Vì 378>369 nên 123.126+378>123.126+369

⇒ 126²>123.129 hay 123.129<126²