Răspunsuri

2014-10-12T12:14:04+03:00
D) 8b+26=58
8b=58-26
8b=32
b= \frac{32}{8}
b=4

e)3(2+x)=9
2+x= \frac{9}{3}
2+x=3
x=3-2
x=1

f)(5-x):3=15
5-x=15*3
5-x=45
x=5-45
x=-40

g)42:(y+4)=6
y+4=42:6
y+4=7
y=7-4
y=3