Tính nhanh: $\frac{108}{120}+\frac{104}{130}+\frac{98}{140}+\frac{90}{150}+\frac{80}{160}+\frac{68}{170}+\frac{54}{180}+\frac{38}{190}+\frac{1}{10}$

Tính nhanh: $\frac{108}{120}+\frac{104}{130}+\frac{98}{140}+\frac{90}{150}+\frac{80}{160}+\frac{68}{170}+\frac{54}{180}+\frac{38}{190}+\frac{1}{10}$

0 bình luận về “Tính nhanh: $\frac{108}{120}+\frac{104}{130}+\frac{98}{140}+\frac{90}{150}+\frac{80}{160}+\frac{68}{170}+\frac{54}{180}+\frac{38}{190}+\frac{1}{10}$”

  1. Giải thích các bước giải:

    `108/120+104/130+98/140+90/150+80/160+68/170+54/180+38/190+1/10`

    `=9/10+4/5+7/10+3/5+1/2+2/5+3/10+1/5+1/10`

    `=(9/10+1/10)+(4/5+1/5)+(7/10+3/10)+(3/5+2/5)+1/2`

    `=4+1/2`

    `=9/2`

    Bình luận
  2. Đáp án:

    `108/120+104/130+98/140+90/150+80/160+68/170+54/180+38/190+1/10=9/2`

    Giải thích các bước giải:

    Ta có: `108/120+104/130+98/140+90/150+80/160+68/170+54/180+38/190+1/10`

    `=(108/120+1/10)+(104/130+38/190)+(98/140+54/180)+(90/150+68/170)+80/160`

    `=(9/10+1/10)+(4/5+1/5)+(7/10+3/10)+(3/5+2/5)+1/2`

    `=1+1+1+1`

    `=4+1/2`

    `=9/2`

     

    Bình luận

Viết một bình luận