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

Toán Lớp 8: 1) (???? + ????)???? − (???????? + ????)(???????? − ????)

Home/ Toán Lớp 8: 1) (???? + ????)???? − (???????? + ????)(???????? − ????)

Toán Lớp 8: 1) (???? + ????)???? − (???????? + ????)(???????? − ????)

Tháng Tám 31, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: 1) (???? + ????)???? − (???????? + ????)(???????? − ????)

Comments ( 1 )

  1. buithaianh98
    buithaianh98
    31 Tháng Tám, 2022 at 2:34 sáng
    Reply
    (x+2)^2-(2x+5)(2x-5)
    =x^2+4x+4-4x^2+25
    =-3x^2+4x+29
    Áp dụng:
    (a+b)^2=a^2+2ab+b^2
    a^2-b^2=(a-b)(a+b)
     

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

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