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

Toán Lớp 9: Rút gọn biểu thức √9x^2 -2x B.√6+√10÷√21+√35

Toán Lớp 9: Rút gọn biểu thức
√9x^2 -2x
B.√6+√10÷√21+√35

Comments ( 2 )

  1. Giải đáp:
    sqrt{9x^2}-2x
    = sqrt9 sqrt{x^2}-2x
    = 3|x|-2x
    $\\$
    sqrt6+sqrt10 : sqrt21+sqrt35
    = sqrt6+sqrt{10:21}+sqrt35
    = sqrt6+sqrt{10/21}+sqrt35
    = sqrt6+\frac{sqrt10}{sqrt21}+sqrt35
    = sqrt6+\frac{sqrt210}{21}+sqrt35

  2.  √9×x^2-2x
    3×|x|-2x 
    √6+√10:√21+35
    √6+210:21+√35

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