rut gon 10^2+8^2+...+2^2+(9^2+7^2+...+1^2)
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rut gon 10^2+8^2+...+2^2+(9^2+7^2+...+1^2)
rut gon 1*2*5+3*3*15+4*8*20+7*14*350/2*5*11+6*10+33+8*20*44+14*35*770
rut gon phan so
(10^2012)+2/3
(10^2003)+8/9
2^10.3^10-2^10.3^9/2^9.3^10hay rut gon
210.310-210.39 / 29.310 =210.(310-39) / 29.310
=210.3 / 29.310
=2 / 39
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rut gon phan so 2^10.3^10-2^10.3^9 /2^9.3^10
Phân số trên = 2^10.3^9.(3-1)/2^9.3^10
= 2^10.3^9.2/2^9.3^10
= 2^11.3^9/2^9.3^10
= 2^2/3 = 4/3
Tk mk nha
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rut gon A=1+1^ 2+1^ 3+1^4+1^5+1^6+1^7+1^8+1^9+...+1^2012
cac bn giup mk nka
rut gon a=4 mu 5. 9 mu 4 - 2 . 6mu 9/2 mu 10. 3 mu 8+ 6mu 8 .20
RUT GON BIEU THUC:
\(A=3x^{n-2}\left(x^{n+2}-y^{n+2}\right)+y^{n+2}\left(3x^{n-2}-y^{n-2}\right)\)
\(B=x^{10}-7x^9+7x^8-7x^7+...+7x^2-7x+2\)
Rut gon: A=212.14.125 phan 355.6
B=210.13 +210.65 phan 28.104.
C=713+75 phan 710 +72.
A = \(\dfrac{21^2.14.125}{35^5.6}\)
= \(\dfrac{\left(3.7\right)^2.\left(2.7\right).5^3}{\left(5.7\right)^5.\left(2.3\right)}\)
= \(\dfrac{3^2.7^2.2.7.5^3}{5^5.7^5.2.3}\)
= \(\dfrac{3^2.7^3.2.5^3}{5^5.7^5.2.3}\)
= \(\dfrac{3}{5^2.7^2}\)
= \(\dfrac{3}{35^2}\)
@Pham Thi Thu Trang
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B = \(\dfrac{2^{10}.13+2^{10}.65}{2^8.104}\)
= \(\dfrac{2^{10}\left(13+65\right)}{2^8.104}\)
= \(\dfrac{2.78}{104}\)
= \(\dfrac{3}{2}\)
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C = \(\dfrac{7^{13}+7^5}{7^{10}+7^2}\)
= \(\dfrac{7^5\left(7^8+1\right)}{7^2\left(7^8+1\right)}\)
= 73
@Pham Thi Thu Trang
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