a. x² - 2

<=> x² - \(\left(\sqrt{2}\right)^2\)

<=> (x - \(\sqrt{2}\))(x + \(\sqrt{2}\))

b. y³ - 13 

<=> y³ - \(\left(\sqrt[3]{13}\right)^3\)

<=> \(\left(y-\sqrt[3]{13}\right)\left[y^2+\sqrt[3]{13}y+\left(\sqrt[3]{13}\right)^2\right]\)

c. 2x² - 4

<=> \(\left(x\sqrt{2}\right)^2\) - 2²

<=> \(\left(x\sqrt{2}-2\right)\left(x\sqrt{2}+2\right)\)

d. (x - 1)³ - (y + 1)³

\(\Leftrightarrow\left[\left(x-1\right)-\left(y+1\right)\right]\left[\left(x-1\right)^2+\left(x-1\right)\left(y+1\right)+\left(y+1\right)^2\right]\)

\(\Leftrightarrow\left(x-1-y-1\right)\left[\left(x-1\right)^2+\left(x-1\right)\left(y+1\right)+\left(y+1\right)^2\right]\)

\(\Leftrightarrow\left(x-y-2\right)\left[\left(x-1\right)^2+\left(x-1\right)\left(y+1\right)+\left(y+1\right)^2\right]\)

a. x - 53 + x - 517 + x - 519 = 0

<=> x + x + x = 519 + 517 + 53

<=> 3x = 1089

<=> x = 363

b. x + 1015 + x - 1035 + x - 1237 = -3

<=> x + x + x = -3 - 1015 + 1035 + 1237

<=> 3x = 1254

<=> x = 418

c. x + 120 + x 219 + x + 318 = x + 417 + x + 516 + x + 615

<=> x + x - x - x - x = 417 + 516 + 615 - 120 - 219 - 318

<=> -x = 891

<=> x = -891

d. Ko có kết quả ko tìm đc x nha bn, bn xem lại đề rồi nhắc mik.

thế là chết rồi

avata nice

Avata chất

ok bn

Vào làm gì