Răspuns :
x + x- 4 grade si 12 minute = 90 grade | - 4 grade si 12 minute
2x = 85 grade 48 minute | :2
x = 42 grade 54 minute
2x = 85 grade 48 minute | :2
x = 42 grade 54 minute
a+b=90 de grade
a=b-4 grade si 12 minute
si introduci in formula generala a+b=90 de grade
a=b-4 grade si 12 minute
si introduci in formula generala a+b=90 de grade