a. 5×x+x÷0.5+2×x+x=75/100 b.3/4+x+x÷0.2+5×x-x×0.75=1.1/4 c.3/2×x+x÷1/4+x×150%+x×3=125%

0 bình luận về “a. 5×x+x÷0.5+2×x+x=75/100 b.3/4+x+x÷0.2+5×x-x×0.75=1.1/4 c.3/2×x+x÷1/4+x×150%+x×3=125%”

1. a.

   `5 × x + x ÷ 0.5 + 2 × x + x = 75/100`

   `= 5 × x + x × 2 + 2 × x + x × 1 = 75/100`

   `= x × (5 + 2 + 2 + 1) = 75/100`

   `= x × 10 = 75/100`

   `x = 75/100 ÷ 10`

   `x = 75/1000`

   b.

   `3/4 + x + x ÷ 0.2 + 5 × x – x × 0.75 = 1 × 1/4`

   `3/4 + x + x ÷ 0.2 + 5 × x – x × 0.75 = 1/4`

   `= 0.75 + x + x × 5 + 5 × x – x × 0.75 = 0.25`

   `= x × (5 + 5 – 0.75) + 0,75 = 0.25`

   `= x × 9.25 + 0.75 = 0.25`

   `= x × 9.25 = 0.75 – 0.25`

   `= x × 9.25 = 0.5`

   `x = 9.25 ÷ 0.5`

   `x = 18.5`

   c.

   `3/2 × x + x ÷ 1/4 + x × 150% + x × 3 = 125%`

   `= 1.5 × x + x ÷ 0.25 + x × 1.5 + x × 3 = 1.25`

   `= x × (1.5 + 0.25 + 1.5 + 3) = 1.25`

   `= x × 6.25 = 1.25`

   `x = 1.25 ÷ 6.25`

   `x = 0.2`

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