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

Toán Lớp 6: `1-3+5-7+9-. . .+21-23` nhanh nhá

Toán Lớp 6: 1-3+5-7+9-. . .+21-23 nhanh nhá

Comments ( 2 )

  1.  1-3+5-7+9-11+13-15+17-19+21-23
    =-2+5-7+9-11+13-15+17-19+21-23
    =3-7+9-11+13-15+17-19+21-23
    =-4+9-11+13-15+17-19+21-23
    =5-11+13-15+17-19+21-23
    =-6+13-15+17-19+21-23
    =7-15+17-19+21-23
    =-8+17-19+21-23
    =9-19+21-23
    =-10+21-23
    =11-23
    =-12

  2. 1−3+5−7+….+21−23
    =(1−3)+(5−7)+…+(21−23)
    Có số cặp: (23−1):2+1:2=6(cặp)
    =(−2). 6
    =−12

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

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