Question

tim x

1/3 x X + 3/4 x X - 75% = -21 / 4

Answer 1

\(\frac{1}{3}.x+\frac{3}{4}.x-75\%=-\frac{21}{4}\)

      \(\frac{1}{3}.x+\frac{3}{4}.x-\frac{3}{4}=-\frac{21}{4}\)

               \(x.\left(\frac{1}{3}+\frac{3}{4}\right)=-\frac{21}{4}+\frac{3}{4}\)

                              \(x.\frac{13}{12}=-\frac{9}{2}\)

                                       \(x=-\frac{9}{2}:\frac{13}{12}\)

                                        \(x=-\frac{54}{13}\)

Answer 2

=> x.(1/3+3/4) -75/100=-21/4

=> x .13/12   -  3/4     =21/4

=> x. 13/12                =21/4 + 3/4

=> x.13/12                 =6

=> x                          = 6 : 13/12

=> x                          = 72/13

vậy x= 72/13

Answer 3

       1/3 x X + 3/4 x X - 75% = -21/4

<=> 13/12 x X = -21/4 + 75/100

<=> 13/12 x X = -525/100 + 75/100

<=> 13/12 x X = -9/2

<=> X = -54/13

Answer 4

1/3 x X + 3/4 x X - 75% = -21/4

<>_+ : 1/3 x X 3/4 x X - 3/4 = -21/4

** : X x ( 1/3 + 3/4 ) = -21/4 + 3/4

@@ : X x 13/12 = - 9/2

$% : X = -9/2 : 13/12

<++=> : X = 54 / 13 .