Răspuns :
1)Fie x numarul total de piese.
Cat a lucrat primele doua zile?
[tex] \frac{4x}{12} + \frac{5x}{12} = \frac{9x}{12} [/tex]
Cate piese a lucrat in cele 3 zile?
3x/12=9=>
x=360 piese
Cat a lucrat in prima zi?
4 /12*360=120 de piese
Cat a lucrat in a doua zi
5 /12 *360=150 de piese
2)Fie a si b cele doua numere.
a+b=1677
a-b=71⇒a=71+b
71+b+b=1677
71+2b=1677
2b=1606
b=803
a=874
Cat a lucrat primele doua zile?
[tex] \frac{4x}{12} + \frac{5x}{12} = \frac{9x}{12} [/tex]
Cate piese a lucrat in cele 3 zile?
3x/12=9=>
x=360 piese
Cat a lucrat in prima zi?
4 /12*360=120 de piese
Cat a lucrat in a doua zi
5 /12 *360=150 de piese
2)Fie a si b cele doua numere.
a+b=1677
a-b=71⇒a=71+b
71+b+b=1677
71+2b=1677
2b=1606
b=803
a=874
a + b = 1677
a - b = 71
a = 71 + b
71 + b + b = 1677
2b = 1677 - 71
b = 1606 : 2
b = 803
a = 803 + 71
a = 874
a - b = 71
a = 71 + b
71 + b + b = 1677
2b = 1677 - 71
b = 1606 : 2
b = 803
a = 803 + 71
a = 874