AG495
megoldása
1 hónapja
a) √ 5 ·√ 125 =√ 5·125 =√ 625 =25
b) √ 75 ·√ 3 =√ 75·3 =√ 225 =15
c) ugyanaz, mint az a)
d) √ 2 ·√ 12 ·√ 12 =√ 2 ·√ 12·12 =12√ 2
e) √ 73 ·√ 75 =√ 73 ·75 =√ 78 =74 =2401
f) √ 810·40 =√ 10·81·4·10 =√ 400 ·√ 81 =20·9=180
g) √ 8·72 =√ 2·4·2·36 =√ 16 ·√ 36 =4·6=24
h) √ 32·98 =√ 2·16·2·49 =√ 64 ·√ 49 =8·7=56
i) √ 75·6·32 =√ 3·25·2·3·2·16 =√ 36·25·16 =√ 36 ·√ 25 ·√ 16 =6·5·4=120
j) √ 196/81 =√ 196 /√ 81 =14/9
k) √ 54/6 =√ 9 =3
l) √ 75 /73 =√ 72 =7
m) √ 33 /3 =√ 32 =3
n) √ 48 /√ 3 =√ 48/3 =√ 16 =4
o) √ 243 /√ 3 =√ 243/3 =√ 81 =9
p) √ 28 /√ 7 =√ 28/7 =√ 4 =2
q) √ 56 =53 =125
r) √ (-5)4 =√ 54 =52 =25
s) √ 625 =√ 25·25 =25
t) √ 169 =√ 13·13 =13
u) (√ 7 )4 =(√ 7 )2 ·(√ 7 )2 =7·7=49
v) (√ 2 )3 =(√ 2 )2 ·√ 2 =2√ 2
w) (2√ 5 )4 =24 ·(√ 5 )4 =16·52 =16·25=400
x) (3√ 6 )2 =32 ·(√ 6 )2 =9·6=54
0
1
Kommentek
AG495
válasza
1 hónapja
3.
a)
2√ 7 =√ 4·7 =√ 28 , ez a nagyobb
3√ 2 =√ 9·2 =√ 18
b)
6√ 2
3√ 8 =3√ 2·4 =3·2√ 2 =6√ 2 , ezek egyenlőek
c)
4√ 3 =√ 16·3 =√ 48
5√ 2 =√ 25·2 =√ 50 , ez a nagyobb
d)
5√ 5 =√ 25·5 =√ 125
8√ 2 =√ 64·2 =√ 128 , ez a nagyobb
e)
√ 6 /3=√ 6 /√ 9 =√ 6/9 =√ 1/3 =√ 8/24
√ 10 /4=√ 10 /√ 16 =√ 10/16 =√ 5/8 =√ 15/24 , ez a nagyobb
f)
√ 21 /7=5√ 21 /35=√ 25·21 /35=√ 525 /35
√ 15 /5=7√ 15 /35=√ 49·15 /35=√ 735 /35, ez a nagyobb
g)
3√ 5 /4=9√ 5 /12=√ 81·5 /12=√ 405 /12, ez a nagyobb
7√ 2 /6=14√ 2 /12=√ 196·2 /12=√ 392 /12
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1
Kommentek
AG495
válasza
1 hónapja
4.
a) √ 27 =√ 3·9 =3√ 3
b) √ 12 =√ 4·3 =2√ 3
c) √ 108 =√ 36·3 =6√ 3
d) √ 162 =√ 81·2 =9√ 2
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1
Kommentek
AG495
válasza
1 hónapja
4.
e) √ 54 =√ 9·6 =3√ 6
f) √ 32 =√ 16·2 =4√ 2
5.
a) 3√ 7 =√ 9·7 =√ 63
b) 10√ 2 =√ 100·2 =√ 200
c) 4√ 5 =√ 16·5 =√ 80
d) 2√ 9/2 =√ 4·9/2 =√ 18
e) 3√ 2/3 (√ 9·2/3 =√ 6
f) 5√ 3/5 =√ 25·3/5 =√ 15
6.
a) √ 2 +√ 18 -√ 32 =√ 2 +√ 2·9 -√ 2·16 =√ 2 +√ 2 √ 9 -√ 2 √ 16 =√ 2 (1+3-4)=0
b) √ 12 +√ 45 -√ 147 =√ 3·4 +√ 3·15 -√ 3·49 =2√ 3 +√ 15 ·√ 3 -√ 49 ·√ 3 =√ 3 (2+√ 15 -7)=√ 3 (2+√ 15 -7)=√ 3 (√ 15 -5)
c) √ 50 -√ 8 +√ 98 =√ 2·25 -√ 2·4 +√ 2·49 =5√ 2 -2√ 2 +7√ 2 =10√ 2
d) √ 48 -√ 27 +√ 75 =√ 3·16 -√ 3·9 +√ 3·25 =4√ 3 -3√ 3 +5√ 3 =6√ 3
e) √ 72 -√ 32 -√ 8 =√ 2·36 -√ 2·16 -√ 2·4 =6√ 2 -4√ 2 -2√ 2 =0
f) √ 125 -√ 45 -√ 20 =√ 5·25 -√ 5·9 -√ 5·4 =5√ 5 -3√ 5 -2√ 5 =0
g) √ 3 +√ 12 +√ 27 =√ 3 +√ 3·4 +√ 3·9 =√ 3 +2√ 3 +3√ 3 =6√ 3
h) √ 242 +√ 200 +√ 8 =√ 2·121 +√ 2·100 +√ 2·4 =11√ 2 +10√ 2 +2√ 2 =23√ 2
0
1
Kommentek
AG495
válasza
1 hónapja
a) 1/√ 2 =(1/√ 2 )·(√ 2 /√ 2 )=√ 2 /2
b) 24/√ 8 =24/2√ 2 =12/√ 2 =(12/√ 2 )·(√ 2 /√ 2 )=(12√ 2 )/2=6√ 2
c) 5/√ 15 =(5/√ 15 )/(√ 15 /√ 15 )=5(√ 15 )/15=√ 15 /3
d) 19/(2√ 7 )=19/(2√ 7 )·(√ 7 /√ 7 )=(19√ 7 )/(2·7)=(19√ 7 )/14
e) 5/(3√ 2 )=5/(3√ 2 )·(√ 2 /√ 2 )=(5√ 2 )/6
f) (2√ 3 )/(3√ 2 )=(2√ 3 )/(3√ 2 )·(√ 2 /√ 2 )=(2√ 2 √ 3 )/6
g) (10√ 5 )/√ 2 =[(10√ 5 )/√ 2 ]·(√ 2 /√ 2 )=(10√ 2 √ 5 )/2
Módosítva: 1 hónapja
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