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

Toán Lớp 8: Tính nhanh a) 33.55 + 33.67 + 45.33 + 67.67 b) 25² + 35² – 90 + 70.25

Toán Lớp 8: Tính nhanh
a) 33.55 + 33.67 + 45.33 + 67.67
b) 25² + 35² – 90 + 70.25

Comments ( 1 )

  1. a)33.55+33.67+45.33+67.67
    =(33.55+45.33)+(33.67+67.67)
    =33.(55+45)+67.(33+67)
    =33.100+67.100
    =100.(33+67)
    =100.100
    =10000
    b)25^2+35^2-90+70.25
    =(25^2+70.25+35^2)-90
    =(25^2+2.25.35+35^2)-90
    =(25+35)^2-90
    =60^2-90
    =3600-90
    =3510
    mk gửi nha~
    $#chúc tus học tốt!!$
     

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

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