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1.a)3/5+x=2/3 b)x-1/3=5/3 c)2/3x=1/4 d)1,5x=6
2.calculati media aritmetica a numerelor 1/2, 1/3 si 1/4

4.determinati un numar,stiind ca daca la dublul acestuia adunam 2/5 obtinem 1,9


Răspuns :

1.)a)3/5+x=2/3
x=2/3-3/5
x=10/15-9/15
x=1/15
b)x-1/3=5/3
x=5/3+1/3
x=6/3(impartim la 3 sa fie ireductibila)
x=2/1=2
c)2/3x=1/4
x=2/3:1/4
x=2/3*4/1
x=8/3
d)1,5x=6
x=6:1,5
x=4
2.)Ma=(1/2+1/3+1/4):3
Ma=(6/12+4/12+3/12):3
Ma=13/12:3
Ma=13/12*1/3
Ma=13/36
3.)2x+2/5=1,9
2x+2/5=19/10
2x+4/10=19/10
2x=19/10-4/10
2x=15/10(impartim la 5 sa fie ireductibila)
2x=3/2
x=3/2:2
x=3/2*1/2
x=3/4