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

Toán Lớp 8: $5^{2}$ ($-7x^{2}$ + 2x – 5 ) (x – 4) ( $x^{2}$ + 5x – 8 ) (7x + 8 ) (7x – 8)

Toán Lớp 8: $5^{2}$ ($-7x^{2}$ + 2x – 5 )
(x – 4) ( $x^{2}$ + 5x – 8 )
(7x + 8 ) (7x – 8)

Comments ( 1 )

  1. 5²(−7????²+2????−5)
    = 25(−7????²+2????−5)
    =−175????²+50????−125
    (???? – 4) ( ????² + 5???? – 8 )
    = ????³+5????²- 8???? – 4????² – 20???? +32
    = ????³ + ????² – 28???? + 32
    (7???? + 8 ) (7 ????- 8)
    = (7????)² – 8²
    = 49????² – 64

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