Question

Dau coroana! Urgent.

VIII.4.31

VIII.4.32

VIII.4.33

Answer 1

4.31)  a+b=72

        a-b=b:4    => a=b:4+b

notam: b:4=x   => b=4x

inlocuim in relatie:

a=4x:4+4x

a=x+4x

a=5x

5x+4x=72

9x=72

x=72:9

x=8       => a=8*5   => a=40

                 b=8*4    => b=32

verificare:

40+32=72

40-32=32:4    => 8=8

4.32)   a-b=50

          a:b=6    => a=6b

inlocuim in relatie:

6b-b=50

5b=50

b=50:5

b=10      => a=6*10    => a=60

verificare:

60-10=50

60:10=6

4.33) x+x:2+x:4=63

notam: x:4=a   => x=4a

inlocuim in relatie:

4a+4a:2+4a:4=63

4a+2a+a=63

7a=63

a=63:7

a=9    =>x=4*9   => x=36

verificare:

36+36:2+36:4=

=36+18+9=

=54+9=

=63

Answer 2

4.32 numerele sunt 60 si 10
60-10=50 60:10=6