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

Toán Lớp 7: A=1x2x3+3x4x5+–.+48x49x50

Toán Lớp 7: A=1x2x3+3x4x5+………+48x49x50

Comments ( 1 )

  1. A.4=1.2.3.4+3.4.5.4+…+48.49.50.4
    A.4=1.2.3.(4-0)+3.4.5.(6-2)+…+48.49.50.(51-47)
    A.4=1.2.3.4-0.1.2.3+3.4.5.6-2.3.4.5+…+48.49.50.51-47.48.49.50
    A.4=1.2.3.4+48.49.50.51
    A=1.2.3+12.49.50.51
    còn A bằng bao nhiêu bạn tự tính nhé 

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