25² - 15²

= (25 - 15)(25 + 15)

= 10 . 40

= 400

205² - 95²

= (205 - 95)(205 + 95)

= 110 . 300

= 33 000

36² - 14²

= (36 - 14)(36 + 14)

= 22 . 50

= 1 100

950² - 850²

= (950 - 850)(950 + 850)

= 100 . 1 800

= 180 000

`1)(a^[1/4]-b^[1/4])(a^[1/4]+b^[1/4])(a^[1/2]+b^[1/2])`

`=[(a^[1/4])^2-(b^[1/4])^2](a^[1/2]+b^[1/2])`

`=(a^[1/2]-b^[1/2])(a^[1/2]+b^[1/2])`

`=a-b`

`2)(a^[1/3]-b^[2/3])(a^[2/3]+a^[1/3]b^[2/3]+b^[4/3])`

`=(a^[1/3]-b^[2/3])[(a^[1/3])^2+a^[1/3]b^[2/3]+(b^[2/3])^2]`

`=(a^[1/3])^3-(b^[2/3])^3`

`=a-b^2`

a)\(25^2-15^2=\left(25-15\right)\left(25+15\right)=10.40=400\)

b)\(205^2-95^2=\left(205-95\right)\left(205+95\right)=110.300=33000\)

c)\(36^2-14^2=\left(36-14\right)\left(36+14\right)=22.50=1100\)

d)\(950^2-850^2=\left(950-850\right)\left(950+850\right)=100.1800=180000\)

Xong rồi đấy,chúc bạn học tốt

\(205^2-95^2=\)

\(=\left(205-95\right)\left(205+95\right)\)

\(=200.300\)

\(=60000\)

\(36^2-14^2=\)

\(=\left(36-14\right)\left(36+14\right)\)

\(=22.50\)

\(=1100\)

\(205^2-95^2=\left(205-95\right)\left(205+95\right)=110.300=33000\)

\(36^2-14^2=\left(36-14\right)\left(36+14\right)=22.50=1100\)

\(97^2-3^2=\left(97-3\right)\left(97+3\right)=94.100=9400\)

\(205^2-95^2=\left(205+95\right)\left(205-95\right)=300.110=3.100.11.10=33000\)

\(36^2-14^2=\left(36+14\right)\left(36-14\right)=50.22=1100\)

\(97^2-3^2=\left(97+3\right)\left(97-3\right)=100.94=9400\)

\(89^2-18.89+9^2=\left(89-9\right)^2=80^2=6400\)

\(41^2+82.59+59^2=\left(41+59\right)^2=100^2=10000\)

\(1,24^2-2,84.0,24+0,24^2=\left(1,24-0,24\right)^2=1^2=1\)

\(=\left(3x\right)^2-2\cdot3x\cdot4+4^2-1\)

\(=\left(3x-4\right)^2-1^2\)

\(=\left(3x-4-1\right)\left(3x-4+1\right)\)

\(=\left(3x-5\right)\left(3x-3\right)\)

B = -x² + 24x - 405
   = -(x² - 24x + 405)
   = -(x² - 2.x.12 + 12²) - 261
   = -(x - 12)² - 261

k minh minh lam cho

C=47.53=(50-3)(50+3)=50²-3²=2500-9=2491