Question

(x-1supra2)*2dupra5=1supra15 b)-x+7supra3)•2supra4=3dupra8 c)3supra5•(2x-5supra3)=6supra5. d)(-4supra5+1supra10)•x+1=3. r)0,75+3,73=0,75. f(4supra7+3supra7x):3supra7=14supra5​

Answer 1

Răspuns:

a.  x=4/3

b. x=19/4

c. x=11/2

d. x=-20/7

r. ????????

f. x=15/22

Explicație pas cu pas:

a. (x-1/2) *2/5=1/15

(x-1)/2 * 2/5= /15

  (x-1) *1/5=1/15

  1/5 *x -1/5=1/15  inmultim cu 15 ambele parti

  3x-3=1

 3x=4

b. (-x+7/3)*2/4=3/8

   (-x+7/3)*1/2=3/8

   -x+7/6=3/8

   8(-x+7)=18

-8x+56=18

-8x=-38 impartim ambele parti ale ecuatiei cu -8

c. 3/5 *(2x-5/3)=6/5

   1/5* (2x-5)=6/5

2/5*x-1=6/5 inmultim ambele parti ale ecuatiei cu 5

2x-5=6

2x=11

d. (-4/5+1/10)*x+1=3

   -7/10 *x+1=3 inmultim ambele parti ale ecuatiei cu 10

-7x+10=30

-7x=20

f. (4/7+3/7x) : 3/7=14/5

(4/7 + 3/7x) * 7/3=14/5

4/3+1/x=14/5

1/x=14/5-4/3

1/x=22/15

15=22x

22x=15