Question

tìm x :

a ) 36 * x + 12 ,67 = 489,67

b ) x * 326,63 = 245,37

c ) 29,5 * ( x + 10 ,25 ) = 376,125 

d ) 748 : (x - 31,72) = 13,6 

giúp mình nha !!!

Answer 1

a ) 36 * x + 12 ,67 = 489,67

36 * x = 489,67 - 12,67 

36 * x = 477

x = 477 : 36 = 13,25

b ) x * 326,63 = 245,37

x = 245,37 : 326,63 = 0,7512169733....

c ) 29,5 * ( x + 10 ,25 ) = 376,125 

 x + 10 ,25 = 376,125 : 29,5

 x + 10 ,25 = 12,75

x = 12,75 - 10,25 = 2,5

d ) 748 : (x - 31,72) = 13,6 

x - 31,72 = 748 : 13,6

x - 31,72 = 55

x = 55 + 31,72 = 86,72

Answer 2

a, 36 * x + 12,67 = 489,67

    36 * x = 489,67 - 12,67 = 477

            x = 477 : 36 = 13,25

b, x * 326,63 = 245,37

    x = 245,37 : 326,63 = 0,75

c, 29,5 * (x + 10,25) = 376,125

    x + 10,25 = 376,125 : 29,5 = 12,75

    x = 12,75 - 10,25 = 2,5

d, 748 : ( x - 31,72 ) = 13 ,6

              ( x - 31,72 ) = 748 : 13,6 = 55

                x = 55 + 31,72 = 86,72