4(x+5)-3(x-1)=12 2(x+3)-3(x+1)-5=20 3(x-2)-5(x+4)+1=8 5(x-1)-4(x-2)=20 2(x-5)-4(x+1)=9

Bởi

4(x+5)-3(x-1)=12
2(x+3)-3(x+1)-5=20
3(x-2)-5(x+4)+1=8
5(x-1)-4(x-2)=20
2(x-5)-4(x+1)=9

0 bình luận về “4(x+5)-3(x-1)=12 2(x+3)-3(x+1)-5=20 3(x-2)-5(x+4)+1=8 5(x-1)-4(x-2)=20 2(x-5)-4(x+1)=9”

  1. Đáp án:

     

    Giải thích các bước giải:

    a) $4.(x+5)-3.(x-1)=12$

    $\Leftrightarrow 4x+20-3x+3=12$

    $\Leftrightarrow x=-20-3+12$

    $\Leftrightarrow x=-11$

    b) $2.(x+3)-3.(x+1)-5=20$

    $\Leftrightarrow 2x+6-3x-3=20+5$

    $\Leftrightarrow 3x-2x=6-3-20-5$

    $\Leftrightarrow x=-22$

    c)$3.(x-2)-5.(x+4)+1=8$

    $\Leftrightarrow 3x-6-5x-20=8-1$

    $\Leftrightarrow 5x-3x=-6-20-8+1$

    $\Leftrightarrow 2x=-33$

    $\Leftrightarrow x=\frac{-33}{2}$

    d) $5.(x-1)-4.(x-2)=20$

    $\Leftrightarrow 5x-5-4x+8=20$

    $\Leftrightarrow x=20-8+5$

    $\Leftrightarrow x=17$

    e) $2(x-5)-4(x+1)=9$

    $\Leftrightarrow 2x-10-4x-4=9$

    $\Leftrightarrow 4x-2x=-10-4-9$

    $\Leftrightarrow 2x=-23$

    $\Leftrightarrow x=\frac{-23}{2}$

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