a)2/3-4.(1/2+30/4) b)(-1/3+5/6) c)-1/24-[1/4-(1/2-7/8) d)(5/7-7/5)-[1/2-(-2/7-1/10) e)2(2x-3)=1/2 f)(x/2-1)=3 g)(-x+2/5)+1/2=3,5 h)(x-1/3)=2 1/5

Bởi

a)2/3-4.(1/2+30/4)
b)(-1/3+5/6)
c)-1/24-[1/4-(1/2-7/8)
d)(5/7-7/5)-[1/2-(-2/7-1/10)
e)2(2x-3)=1/2
f)(x/2-1)=3
g)(-x+2/5)+1/2=3,5
h)(x-1/3)=2 1/5

0 bình luận về “a)2/3-4.(1/2+30/4) b)(-1/3+5/6) c)-1/24-[1/4-(1/2-7/8) d)(5/7-7/5)-[1/2-(-2/7-1/10) e)2(2x-3)=1/2 f)(x/2-1)=3 g)(-x+2/5)+1/2=3,5 h)(x-1/3)=2 1/5”

  1. Đáp án  a) -94/3

    B) 1/2

    C) -2/3 

    D) -11/7

    E) 13/8

    F) x=8

    G) -13/5

    H) 38/15

     

    Giải thích các bước giải:

     Bài làm ở dưới đây

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  2. `*` 

    `2/3-4(1/2+30/4)=2/3-4*8=2/3-32=-94/3`

    `*`

    `-1/3+5/6=-2/6+5/6=1/2`

    `*`

    `-1/24-[1/4-(1/2-7/8)]=-1/24-(1/4+3/8)=-1/24-5/8=-2/3`

    `*`

    `(5/7-7/5)-[1/2-(-2/7-1/10)=-24/35-[1/2+27/70]=-24/35-31/35=-11/7`

    `*` 

    `2(2x-3)=1/2`

    `<=>4x-6=1/2`

    `<=>4x=13/2`

    `<=>x=13/8`

    `*`

    `x/2-1=3`

    `<=>x/2=4`

    `<=>x=8`

    `*`

    `(-x+2/5)+1/2=3,5`

    `<=>-x+2/5=3`

    `<=>-x=13/5`

    `<=>x=-13/5`

    `*`

    `x-1/3=2 1/5`

    `<=>x-1/3=11/5`

    `<=>x=38/15`

    Vậy …………….

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