Ajutati-ma
1)Rezolvati in multimea R ecuatia :
a)2z-4=8-z
b)5(x-7)=3(x-4)-13
2)Aflati DVA al raportului algebric :
a)x/3x+0.2
b)1-x/2/3x-5
c)3x/2.8-0.1x
3)Continuati rezolvarea:
a)4x+1/3-3x-1/5=15-25-x/4<=>20*(4x+1)-?(3x-1)=15*60-?*(25-x)<=>...

Răspunsuri

2014-05-07T21:10:28+03:00
A.2x+7=0
2x=-7
x=-7/2
b.(x-1)(x+2)=0
x²+2x-x-2=0
x²+x-2=0
x²+x=2
x²=2-x
x=√2-x