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Andriutza
a fost răspuns

calculati ecuatiile:
a) 3x+2=2x-1
b) 2,5y-4= 5y+2,4
c) 3z+4=3-2z
d) √2-7x=2x-2√2

Răspuns :

a) 3x-2x=1-2 <=> x=-1 
b) 2,5y-5y=2,4+4 <=> 2,5y=6,4 <=> y= 6,4:2,5 => y=2,56
c) 3z+2z=3-4 <=> 5z=-1 <=> z=-1\5 
d) 7x-2x=-2√2-√2 <=>-9x= √2 => x=√2\-9