Question

va rog ajutatima cine răspunde corect dau coronița! !!!!!!Va rog ,VA implor!!!!Ajutatima!!!!

Answer 1

2.
2,5/1,25=x/3,6      x=2,5×3,6/1,25=7,2

3.x=24×14/42=8

4.
13%x=65
x=65:13%=65×100/13=500

5.
a/b=1/5    5a=b
a+b=90°
a+5a=90°
6a=90°
a=15°
b=5a=5×15°=75°

6.
2x/3y=1/2
2x/3y  × 3/2=1/2× 3/2
x/y=3/4       
y=4x/3
(2x-y)/(x+y)=(2x-4x/3)/(x+4x/3)=[(6x-4x)3]/[(3x+4x)/3]=2/7

7.
10 muncitori ....1 lucrare .....6 zile
1 muncitor ....1 lucrare .....60 zile
15muncitori ....1 lucrare .....60:15=4 zile