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

Toán Lớp 8: Rút gọn: a) 5x 1 − 2x + (5x + 1)(2x − 3) GIẢI THÍCH CHO MÌNH CÁCH LÀM VỚI!

Toán Lớp 8: Rút gọn:
a) 5x 1 − 2x + (5x + 1)(2x − 3)
GIẢI THÍCH CHO MÌNH CÁCH LÀM VỚI!

Comments ( 1 )

  1. 5x + 1 − 2x + (5x + 1)(2x − 3)
    = (5x + 1) + (5x + 1)(2x − 3) − 2x
    = (5x + 1)(1 + 2x – 3) – 2x
    = (5x + 1)(2x + 2) – 2x
    = 2(5x + 1)(x + 1) – 2x
    = 2[(5x + 1)(x + 1) – x]
    = 2(x² + 6x + 1 – x)
    = 2(x² + 5x + 1)
     

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

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