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

Toán Lớp 6: tim x (x+1)+(x+2)+…+(x+9)+(x+10)=75

Toán Lớp 6: tim x (x+1)+(x+2)+…+(x+9)+(x+10)=75

Comments ( 2 )

  1. $(x+1)$ $+$ $(x+2)$ $+$ $…$ $+$ $(x+9)$ $+$ $(x+10)$ $=$ $75$
    $x+1$ $+$ $x+2$ $+$ $…$ $+$ $x+9$ $+$ $x+10$ $=$ $75$
    $(x$ $+$ $x$ $+$ $…$ $+$ $x)$ $+$ $(1$ $+$ $2$ $+$ $…$ $+$ $10$) $=$ $75$
    $10x$ $+$ $55$ $=$ $75$
    $10x$ $=$ $75$ $-$ $55$
    $10x$ $=$ $20$
    $x$ $=$ $20$ $:$ $10$
    $x$ $=$ $2$
    $Chúc$ $bạn$ $học$ $tốt!$

  2. Giải đáp + Lời giải và giải thích chi tiết:
    (x + 1) + (x + 2) +…+ (x + 9) + (x + 10) = 75
    x + 1 + x + 2 +…+ x + 9 + x + 10 = 75
    10x + 55 = 75
    10x = 75 – 55
    10x = 20
    x = 20:10
    x = 2
    @Ryan

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