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2014-06-17T22:26:00+03:00
1)1 intreg 7/12=  19/12

aducem la acelasi numitor in paranteza

(9+10)/24 : 19/12=

=19/24 * 12/19= 12/24= 1/2

2)0,5= 5/10 =1/2

(2x-4)/1/2=12

(2x-4)=2*12/1

(2x-4)=24

2x=24+4
2x=28
x=28:2
x=14

3)7c...........10,5lei
5c..................x

x=5*10,5/7
x=52,5/7
x=7,5 lei

4)[ -819 + (-1075+819)] : (-25)=

=[ -819 + (-256)] : (-25)=

= (-819-256): (-25)=

=(-1075): (-25)= 43
3 5 3