Question

решить...........................................

Answer 1

Ответ:1.1 4/5x*x+2/5=4

9/5x+2/5=4

9x+2=20

9x=20-2

9x=18/9

x=2

2.3 1/2*x-1/3=13 2/3

7/2x-1/3=41/3

21x-2=82

21x=82+2

21x=84/21

x=4

3.9-1/6x=8 1/5

9-1/6x=41/5

270-5x=246

-5x=246-270

-5x=-24

x=24/5

x=4 4/5

4.5+3 1/2*x=5 7/8

5+7/2x=47/8

40+28x=47

28x=47-40

28x=7

x=1/4