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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1. Đáp án:

    

   Giải thích các bước giải:

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2. 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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