A = 2^2 + 4^2 + 6^2 +...+ 100^2
A = (2.1)^2 + (2.2)^2 + ... + (2.50)^2
A = 2^2.1^2 + 2^2.2^2 + ... + 2^2.50^2
A = 2^2(1^2 + 2^2 + ... + 50^2)
A = 4.\(\frac{5.\left(50+1\right).\left(2.50+1\right)}{6}\)
A = 4.4292,5 = 17170
A = 2^2 + 4^2 + 6^2 +...+ 100^2
A = (2.1)^2 + (2.2)^2 + ... + (2.50)^2
A = 2^2.1^2 + 2^2.2^2 + ... + 2^2.50^2
A = 2^2(1^2 + 2^2 + ... + 50^2)
A = 4.\(\frac{5.\left(50+1\right).\left(2.50+1\right)}{6}\)
A = 4.4292,5 = 17170
Tính:A=1+2-3-4+5+6-7-8+9+10-11-12+.....+97+98-99-100
\(A =\)\(\dfrac{101+100+99+98+...+3+2+1}{101-100+99-98+...+3-2+1}\)
\(B=\) \(\dfrac{3737.43-4343.37}{2+4+6+...+100}\)
Làm cách lớp 6 thôi ah
D = 1 - 6 + 11 - 16 + ... + 111
F = 2^100 - 2^99 - 2^98 - ...- 2^2 - 2 - 1
E = 1 + 2 - 3 -4 +5 + 6 - 7 - 8 +....+ 249 + 250
H = 1 -2 -3 -4 - 5 -6 - ... -97 - 98 - 99 - 100
S=1+2^2+2^4+2^6+…+2^98+2^100
cho B=12/(2*4)^2+20/(4*6)^2+...+388/(96*98)^2+396/(98*100)^2. hãy so sánh B với 1/4
bài 1
A=1*2*3+2*3*4+3*4*5+...+99*100*101
B=1*3*5+3*5*7+...+95*97*99
C=2*4+4*6+..+98*100
D=1*2+3*4+5*6+...+99*100
E=1^2+2^2+3^2+...+100^2
G=1*3+2*4+3*5+4*6+...+99*101+100*102
H=1*2^2+2*3^2+3*4^2+...+99*100^2
I=1*2*3+3*4*5+5*6*7+7*8*9+...+98*99*100
K=1^2+3^2+5^2+...+99^2
Tính:
A=1-2-3+4+5-6-7+8+...+97-98-98+100
B= 1-2+2^2-2^3+...+2^100
C= 2^100-2^99-2^98-...-2^2-2-1
Các bạn giúp mình nhanh với! chiều thứ 2 mình phải nộp rồi
Tính
a)A=101+100+99+98+…+3+2+
101-100+99+98+…+3-2+1
b)B=3737.43-4343.37
2+4+6+…+100
Tính nhanh
A= 1-2+3-4+....+99-100
B= 1-2-3+4+5-6-7+....+97-98-99+100
C= 2 mũ 100 - 2 mũ 99 - 2 mũ 98 - 2 mũ 2 - 2 -1