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

Toán Lớp 8: Phân tích đa thức sau thành nhân tử: 5a(x – 7) + b(7 – x)

Toán Lớp 8: Phân tích đa thức sau thành nhân tử: 5a(x – 7) + b(7 – x)

Comments ( 2 )

  1.   $5a(x – 7) + b(7 – x)$  
    $=5a (x – 7)-b (x-7)$
    $=(x-7) (5a-b)$
     

  2. \text{*Ta có:5a(x – 7) + b(7 – x)}
    \text{=5a.(x-7)+b.(x-7)}
    \text{=(x-7).(5a+b)}

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