Question

a]X:100+Xx0,2=1,26

b]X:0,5+Xx3=12

Answer 1

a)X:100+Xx0,2=1,26

  X:100+Xx:5=1,26

  X:(100+5)=1,26

  X:105=1,26

  X=1,26x105

  X=132,3

Answer 2

b)X:0,5+Xx3=12

   Xx2+X*3=12

   Xx(2+3)=12

   Xx5=12

  X=12:5

  X-2,4

Answer 3

a] X:100+Xx0,2=1,26

=>Xx(1/100)+Xx(1/5)=126/100

=>Xx(1/100+1/5)=126/100

=>Xx(21/100)=126/100

=>X=126/100 : 21/100

=>X=126/100 x 100/21

=>X=126/21=6

=>X=6

Vậy X=6

b]X:0,5+Xx3=12

=>Xx2+Xx3=12

=>Xx5=12

=>X=12/5

Vậy X=12/5 

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