Question

Rezolvați ecuațiile
x+4 / 9=-2/3
12+x=-7 2/3
7/9•x=35/37
x-1=5/2
(-2•1/2) •x=45/15

Answer 1

Răspuns:

a) x=-10

b) x=-36

c) x=45/37

d) x=3,5

e) x=-3

Explicație pas cu pas:

a) 4+x/9=-2/3

-2×9=3(4+x)

-18=3x+12

-18-12=3x

3x=-30

x=-30÷3

x=-10

b) 12+x=-72/3

3(12+x)=-72

36+3x=-72

3x=-72-36

x=-108÷3

x=-36

c) 7/9x=35/37

7x=9×35/37

7x=315/37

x=315/37:7/1

x=315/37×1/7

x=45/37

d) x-1=5/2

2(x-1)=5

2x-2=5

2x=5+2

2x=7

x=7÷2

x=3,5

e) (-2×1/2)x=45/15

(-2/2)x=45/15

-1x=45/15

-x×15=45

-15x=45

x=45÷(-15)

x=-3