Question

1+[2×(1+c)-59]×9=10.vreau raspunsul

Answer 1

1+[2×(1+c)-59]×9=10-1
[2×(1+c)-59]×9=9/:9
2×(1+c)-59=1/+59
2×(1+c)=60/:2
1+c=30-1
c=29

VERIFICARE:
1+[2×(1+29)-59]×9=
=1+(2×30-59)×9
=1+(60-59)×9
=1+1×9
=1+9
=10 deci este A (adica corect)

Sper ca te-am ajutat