ALGEBARSKI IZRAZI
kvadrat zbroja - MIM-Sraga
kvadrat zbroja - MIM-Sraga
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M-1-Kvadrat binoma<br />
Rješenja i kompletni postupak<br />
2 2<br />
34. Kvadriramo po pravilu: A+ B = A + 2⋅A⋅ B+ B i A− B = A −2⋅A⋅ B+<br />
B<br />
To pravilo možemo pisati i ovako:<br />
( ) ( )<br />
2 2 2 2<br />
( ) i ( )<br />
2 2 2 2 2<br />
I + II = I + 2⋅I ⋅ II + II I − II = I −2⋅I ⋅ II + II<br />
2<br />
Sve o kvadratu binoma morali bi znati već iz 8. razreda ali ponovimo to još jednom.<br />
Pogledajmo kako to radimo na dva primjera:<br />
( + ) ( − )<br />
2 2<br />
a) x 1 b) x 1<br />
ili<br />
( )<br />
objašnjenje:<br />
( )<br />
( )<br />
2 2 2 2<br />
a) x+ 1 = x + 2⋅x⋅ 1+ 1 = x + 2x+<br />
1<br />
2 2 2 2<br />
x+ 1 = x + 2⋅x⋅ 1+ 1 = x + 2x+<br />
1<br />
↑ ↑ ↑ ↑ ↑<br />
A+ B = A + 2 ⋅A⋅ B+<br />
B<br />
( )<br />
( )<br />
2 2 2<br />
( )<br />
( )<br />
2 2 2 2<br />
x+ 1 = x + 2⋅x⋅ 1+ 1 = x + 2x+<br />
1<br />
↑ ↑ ↑ ↑ ↑<br />
2 2<br />
I + II = I + 2⋅I⋅II<br />
+ II<br />
↓<br />
ovo pravilo čitamo ovako:<br />
2 2 2 2<br />
2 2 2 2<br />
2<br />
Prvi plus drugi na kvadrat<br />
jednako je prvi na kvadrat, plus dvostruki prvi puta drugi, plus drugi na kvadrat.<br />
b) x− 1 = x −2⋅x⋅ 1+ 1 = x − 2x+<br />
1<br />
objašnjenje:<br />
x− 1 = x −2⋅x⋅ 1+ 1 = x − 2x+<br />
1<br />
↑ ↑ ↑ ↑ ↑<br />
A− B = A −2⋅A⋅ B+<br />
B<br />
( )<br />
2 2 2<br />
ili<br />
( )<br />
( )<br />
2 2 2 2<br />
x− 1 = x −2⋅x⋅ 1+ 1 = x − 2x+<br />
1<br />
↑ ↑ ↑ ↑ ↑<br />
I − II = I −2⋅I⋅ II + II<br />
2 2 2<br />
( ) ( )<br />
2 2 2 2 2 2<br />
1) x + y = x + 2xy + y 2) y + x = y + 2⋅y⋅ x + x = x + 2xy + y<br />
( ) ( )<br />
2 2 2 2 2 2<br />
3) x − y = x − 2xy+ y 4) y− x = y −2⋅y⋅ x+ x = x<br />
2 2<br />
+ 2xy+<br />
y<br />
2 2<br />
( )<br />
2 2 2<br />
5) x+ 3 = x + 2⋅x⋅ 3 + 3 =<br />
6x<br />
9<br />
2<br />
= + +<br />
x<br />
M.I.M.-Sraga -2003./2013.<br />
www.mim-sraga.com<br />
3<br />
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