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

Toán Lớp 6: Lưu avatar 1.2+3.4+…+99.100 – Mong trả lời theo cách lớp 6

Toán Lớp 6: Lưu
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1.2+3.4+…+99.100 – Mong trả lời theo cách lớp 6

Comments ( 2 )

  1. @hungff
    A=1.2+3.4+…..+99.100
    =>3A=1.2.3+2.3.3+3.4.3+….+99.100.3
    =>3A=1.2.(3-0)+2.3.(4-1)+3.4.(5-2)+…99.100(101-98
    =>3A=1.2.3+2.3.4-1.2.3+3.4.5-2.3.4+…..+99.100.101-98.99.100
    =>3A=99.100.101
    =>A=99.100.101:3
    =>A=(99:3).100.101
    =>A=33.100.101
    =>A=333 300
     

  2. #huy
    A =1.2+3.4+…..+99.100
    =>3A=1.2.3+2.3.3+3.4.3+….+99.100.3
    =>3A=1.2.(3-0)+2.3.(4-1)+3.4.(5-2)+…99.100(101-98)
    =>3A=1.2.3 + 2.3.4 – 1.2.3 + 3.4.5 – 2.3.4 +…..+99.100.101 – 98.99.100
    =>3A= 99.100.101
    =>A=99.100.101:3
    =>A= (99:3).100.101
    =>A=33.100.101
     

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