e, 27.(-53)+(-27).47 f, `17/6` + `26/-12` – `-13/39` g, `2/7` + `-5/7` . `14/35` h, `-1/4` + ( `-5/8` + `1/4` )

0 bình luận về “e, 27.(-53)+(-27).47 f, `17/6` + `26/-12` – `-13/39` g, `2/7` + `-5/7` . `14/35` h, `-1/4` + ( `-5/8` + `1/4` )”

1. Đáp án:

    

   Giải thích các bước giải:

    e, 27.(-53)+(-27).47

   =27.(-53)+27.(-47)

   =27(-53-47)

   =27.(-100)

   =-2700

   g,2/7+(-5/7).14/35

   =2/7+(-5.14/7.35)

   =2/7+(-1.5.2.7/7.5.7

   2/7+(-1.2/7)

   =2/7+(-2/7)

   =0

   f,17/6+26/-12-(-13/39)

   =34/12+(-26/12)+1/3

   =8/12+1/3

   =2/3+1/3

   =3/3=1

   h,-1/4+(-5/8+1/4)

   =-1/4+(-5/8)+1/4

   =-1/4+1/4-5/8

   =0-5/8=-5/8

   Trả lời

2. Tham khảo

    `e) 27.-53-27.47`

   `=27.(-53-47)`

   `=27.-100`

   `=-2700`

   `f) \frac{17}{6}-\frac{26}{12}-\frac{13}{39}`

   `=\frac{17}{6}-\frac{13}{6}-\frac{13}{39}`

   `=\frac{4}{6}-\frac{1}{3}`

   `=\frac{1}{3}`

   `g) \frac{2}{7}-\frac{5}{7}.\frac{14}{35}`

   `=\frac{2}{7}-\frac{5}{7}.\frac{2}{5}`

   `=\frac{2}{7}-\frac{2}{7}`

   `=0`

   `h) -\frac{1}{4}-(\frac{5}{8}-\frac{1}{4}`

   `=\frac{-1}{4}-\frac{5}{8}+\frac{1}{4}`

   `=\frac{-5}{8}`

   `\text{©CBT}`

   Trả lời