Question

Am nevoie de ajutor ofer coroana

Answer 1

Explicație pas cu pas:

2) A

3) a+b=12 ->a=12-b

3×a+5×b=50

3×(12-b)+5×b=50

36-3×b+5×b=50

36-2×b=50

2×b=50-36

2×b=14

b=14:2=7 B

4) 7¹⁴×5²:7¹²=7²×5²=49×25=1225 C

1) l zi cheltuie a/2+10

a-(a/2+10)=a-(a+20)/2=2×a-a+20/2=a+20/2 (restul)

ll zi cheltuie a+20/2:3+16=a+20/2×1/3+16

a+20/6+16=a+20/6+96/6=a+116/6

a/2+10+a+116/6+24=a

3×a+60+a+116+114=6×a

4×a+190=6×a

2×a=190

a=190:2

a=95 lei