Tìm x. 75× x + 0,75 × x – x = 30 1,09 × x – 8 × x – x = 48 Cảm ơn nha .

2 bình luận về “Tìm x. 75× x + 0,75 × x – x = 30 1,09 × x – 8 × x – x = 48 Cảm ơn nha .”

1. 75×x+0,75×x-x=30

   75×x+0,75×x-x×1=30

   x×(75+0,75-1)=30

   x×74,75=30

   x=30:74,75

   x=120/299

   Vậy  x=120/299

   1,09×x-8×x-x=48

   1,09×x-8×x-x×1=48

   x×(1,09-8-1)=48

   x×(-7,91)=48

   x=48:(-7,91)

   x=-4800/791

   Vậy  x=-4800/791

   Trả lời
2. a) 75 xx x + 0,75 xx x – x = 30

   x xx 75 + x xx 0,75 – x xx 1 = 30

   x xx (75 + 0,75 – 1) = 30

   x xx 74,75 = 30

   x = 30 : 74,75

   x = 120/299

   Vậy x = 120/299

   b) 1,09 xx x – 8 xx x – x = 48

   x xx 1,09 – x xx 8 – x xx 1 = 48

   x xx (1,09 – 8 – 1) = 48

   x xx (-7,91) = 48

     x = 48 : (-7,91)

   x = -4800/791

   Vậy x = -4800/791

   Trả lời