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

Toán Lớp 8: 2x(3x-2)-2x(3x-7) nhanh ạ-.

Toán Lớp 8: 2x(3x-2)-2x(3x-7) nhanh ạ…..

Comments ( 2 )

  1. 2x(3x-2)-2x(3x-7)
    =2x(3x-2-3x+7)
    =2x[(3x-3x)+(7-2)]
    =2x(0+5)
    =2x.5
    =10x
     

  2. Lời giải và giải thích chi tiết:
     2x(3x-2)-2x(3x-7)
    =2x[(3x-2)-(3x-7)]
    =2x(3x-2-3x+7)
    =2x.5=10x

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

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