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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 9: ptđttnt bằng hằng đẳng thức `a^3-b^3` : `a-b`

Toán Lớp 9: ptđttnt bằng hằng đẳng thức a^3-b^3 :
a-b

Comments ( 2 )

  1. a-b
    =\root[3]{a}^3-\root[3]{b}^3
    =(\root[3]{a}-\root[3]{b})(\root[3]{a}^2+\root[3]{ab}+\root[3]{b}^2)

  2. \qquad a-b
    =(\root[3]{a})^3-(\root[3]{b})^3
    =(\root[3]{a}-\root[3]{b})(\root[3]{a^2}+\root[3]{ab}+\root[3]{b^2})
     

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222-9+11+12:2*14+14 = ? ( )