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Gratiela2905
postare Oct 20 2013, 02:12 PM
Postare #31


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CITAT(Matei @ Oct 4 2009, 11:26 AM) *
Se dau:
x+2y=17
y-3z=4
a )
Adunam, membru cu membru ecuatiile date initial:
(x+2y)+(y-3z)=17+4
x+2y+y-3z=21
x+3y-3z=21

b )
2*(x+2y)+(y-3z)=2*17+4
2x+4y+y-3z=38
2x+5y-3z=38

c )
3*(x+2y)+2*(y-3z)=3*17+2*4
(3x+6y)+(2y-6z)=51+8=59

d) Incercati!?... laugh.gif

Am folosit * pentru semnul inmultirii

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Gratiela2905
postare Oct 20 2013, 02:29 PM
Postare #32


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Ok, am inteles cum se fac primele, adica a, b, dar nu inteleg cum face la c, pentru ca mie imi da 850, iar in carte scrie ca rezultatul este 425.
Daca x+2y=17 si y-3z=4, avem exercitiul (2x+4y)(x+4y-6z), din care eu inteleg ca prima prima parte este in felul urmator:((2x+4y) se traduce in 2(x+2y)=217=34. Partea a doua inteleg ca este urmatoarea:(x+4y-6z), in care eu deduc ca avem un (x+2y) si 2(y-3z) ea ce inseamna ca avem 17 si 8, ca adunate ne dau 25. Cum ajung la rezultatul de 425?, pentru ca mie imi da 850.
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chenlina
postare Jul 8 2017, 06:31 AM
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postare Apr 9 2018, 09:24 AM
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postare May 11 2018, 04:41 AM
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postare Mar 4 2019, 05:51 AM
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