tìm x a,1/3-(1/2-X)=1/5 b,2/3-(1/2-X x 1/3=1/4 c,5/2-(1/3+X x 1/2=1 (x là nhân nhé)

Question

tìm x
a,1/3-(1/2-X)=1/5
b,2/3-(1/2-X x 1/3=1/4
c,5/2-(1/3+X x 1/2=1
(x là nhân nhé)

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Athena 1 tháng 2021-09-06T19:55:50+00:00 2 Answers 5 views 0

Answers ( )

    0
    2021-09-06T19:57:05+00:00

    Đáp án:

     

    Giải thích các bước giải:

     $@kinh0908$

    0
    2021-09-06T19:57:17+00:00

    a,1/3-(1/2-X)=1/5

    ⇔ 1/2 – X = 1/3 – 1/5

    ⇔ 1/2 – X = 2/15

    ⇔ X = 1/2 – 2/15

    ⇔ X = 11/30

    b,2/3-(1/2-X x 1/3)=1/4

    ⇔ 1/2 – X × 1/3 = 2/3 – 1/4 

    ⇔ 1/2 – X × 1/3 = 5/12

    ⇔ X × 1/3 = 1/2 – 5/12

    ⇔ X × 1/3 = 1/12

    ⇔ X = 1/12 : 1/3 

    ⇔ X = 1/4

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

    ⇔1/3 + X × 1/2 = 5/2 – 1

    ⇔1/3 + X × 1/2 = 3/2

    ⇔ X × 1/2 = 3/2 – 1/3

    ⇔ X × 1/2 = 7/6

    ⇔ X = 7/6 :1/2

    ⇔ X = 7/3 

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