Ta có: A=1.4+2.5+3.6+.....+98.101+99.102
A=1.(2+2)+2.(3+2)+3(4+2)+........+98.(100+1)+99(100+2)
A=1.2+1.2+2.3+2.2+3.4+3.2+.........+98.100+98.1+99.100+99.2
A=(1.2+2.3+3.4+.......+99.100)+2.(1+2+3+4+......+99)
A=...................
tính nhanh
\(1.3+2.4+3.5+4.6+...+48.50+49.51\)
\(1.4+2.5+3.6+...+98.101+99.102\)
D =1.4+2.5+3.6+.......+99.102
tính tổng nhanh nghe may ban
1.4+2.5+3.6+....+99.102
tính:
A=1.3+2.4+3.5+...+99.101
B=1.4+2.5+3.6+...+99.102
B=1.4+2.5+3.6+.......+99.102=?
B=1.4+2.5+3.6+...+99.102
B=?
Ai giúp mik bài này mik cho 1000000 tick ^_^"
Tính : A = 1.4 + 2.5 + 3.6 +...+ 99.102
Tính tổng:
a) 1.2 + 2.3 + 3.4 + ... + 99.100
b) 1.3 + 2.4 + 3.5 + ... + 99.101
c) 1.4 + 2.5 + 3.6 + ... + 99.102
Tính \(M=\frac{1.4}{2.3}+\frac{2.5}{3.4}+\frac{3.6}{4.5}+...+\frac{98.101}{99.100}\)
