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

Toán Lớp 8: 2(3-x)^2 – 1/8. ( x – 1 ) ^2

Tháng Sáu 19, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: 2(3-x)^2 – 1/8. ( x – 1 ) ^2

Comments ( 1 )

  1. truongthanhhung
    truongthanhhung
    19 Tháng Sáu, 2022 at 8:01 sáng
    Reply
    Giải đáp:
    $a) 2.(3-x)²-\dfrac{1}{8}.(x-1)²$
    $= 2.(9-6x+x²)-\dfrac{1}{8}.(x²-2x+1)$
    $= 18-12x+2x²-\dfrac{1}{8}x²+\dfrac{1}{4}x-\dfrac{1}{8}$
    $= (2x²-\dfrac{1}{8}x²)+(\dfrac{1}{4}x-12x)+(18-\dfrac{1}{8})$
    $= \dfrac{15}{8}x²-\dfrac{47}{4}x+\dfrac{143}{8}$
     

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

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