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

Toán Lớp 8: nếu 3x + 2y + 3 = 7 thì 9x + 6y -10 =

Toán Lớp 8: nếu 3x + 2y + 3 = 7 thì 9x + 6y -10 =

Comments ( 2 )

  1. Vì theo đề bài
    $3x+2y+3=7$
    $⇒3x+2y=7-3=4$
    Ta có
    $9x+6y-10=3×(3x+2y)-10=3×4-10=12-10=2$

  2. 3x + 2y + 3 = 7
    => 3x+2y=4
    => 9x+6y=12
    => 9x+6y-10=2
    Vậy9x+6y-10=2

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

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