(2x – 3) : 21 = (x + 1) : 16

(2x – 3) : 21 = (x + 1) : 16

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  1. Đáp án: x = $\frac{69}{11}$ 

     

     $\frac{2x-3}{21}$ = $\frac{x+1}{16}$ 

    <=> 16(2x-3) = 21(x+1)

    <=> 32x – 48 = 21x + 48
    <=> 32x – 21x = 21 + 48

    <=> 11x = 69
    => x = $\frac{69}{11}$ 

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