a, 5^n +5^(n+2)
=5(5n-1+5n+1)
=26*5n
b,2/3. 3^(n-1)
=2*3n-2
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ai lam ho minh cau nay moiiiiii????
B=1*2+2*3+....+(n-2)*(n-1)+(n-1)*n
tinh B ai lam duoc minh cho 2 tick
MOI NGUOI OIII LAM NHANH GIUP MINH VOIIIII
Bai 1: Rut gon bieu thuc sau
B=(2/3)^3×(-3/4)^4×(-1)^5/(2/5)^2 × (-5/12)^3
Bai 2: Tim ia tri bieu thuc sau
M= 512- 512/2- 512/2^2- 512/2^2 - 512/2^3...512/2^10
Moi nguoi oi giup em gap vs:
tim x
a,6x^2-(2x-3)(3x+2)-1=0
b,(x-3)(x+7)-(x+5)(x-1)=0
moi nguoi co giup nhanh nhat co the ah!!
Chung minh rang: Voi moi so nguyen duong n thi: 3n+2 - 2n+2 + 3n - 2n chia het cho 10
GIUP MIK VS MOI NGUOI OI!
rut gon bieu thuc:
A=2/7+2/5+2/17-2/293
-----------------------------------
3/7+3/5+3/17-3/293
Tinh gia tri bieu thuc:a.3^2^3^0 b.5^2^0^3
cac bac giup em vs nha em dang can rrrrrrrrrrrratttttttt gap .tinh tichcac don thuc sau
a.[-1/2(a-1)x^3y^4z^2]^5
b.(a^5b^4xy^2x^n-1)(-b^3cx.x^4z^7-n)
trong do a,b,c,n la hang so
moo nguoi tick cho em se tick cho moi nguoi
rut gon bieu thuc
B=1/2+(1/2)^2+(1/2)^3+...+(1/2)^99
((12.8)^3*5)/2^9.15^2
rut gon bieu thuc
dau ngoac de toi ngan cach