( x +1 ) + ( x +2) + ..............+(x+100) = 5750
ai lam nhanh to tich cho
Chung to A = 1 x 2 + 2 x 3 + 3 x 4 + ..... + n x [ n + 1 ] = {[n x [ n + 1 ] x [ n + 2 ] }/3 , n > 0
Cac ban nhanh len nhe ngay mai minh phai nop roi . Ai lam nhanh , dung dau tien minh cho 1 tich
cho A =1/2*3/4*5/6*...*99/100
B=2/3*4/5*6/7*...*100/101
C=1/2*2/3*4/5*...*98/99
a) so sanh A, B, C
b) Chung minh: A*C< A^2< 1/10
c) Chung minh: 1/15< A< 1/10
Lam giup minh di ai lam duoc minh tich dung cho
tim GTNN
A=|x+2|+5
B=|x-3|-7
ai lam nhanh nhat minh tich cho
tinh tong
A=1+2+3+...+100
B=1/2+1/4+1/6+...+1/100
ai lam dung nhanh nhat se k
cho n la so nguyen to lon hon 3. hoi n^2 la nguyen to hay hop so. ai lam loi giai va lam dung la duoc tich
cho dap an la hop so nhung phai lam cach lam
x/2 du 3 x/3 du du 2 hoi x la bao nhieu biet x < 15 ai lam nhanh minh tich 20 cai
2 +2^2 +2^3+ 2^4+ ...+ 2^99+ 2^100
ai nhanh mk tich
B=3^1+3^2+3^3+...+2^2010
ai nhanh minh tich cho
