A=1/2.4+1/4.6+........+1/100.102
A=1/2-1/4+1/4-1/6+.......+1/100-1/102
A=1/2-1/102
A=51/102-1/102
A=50/102
A=25/51
A=1/2.4+1/4.6+........+1/100.102
A=1/2-1/4+1/4-1/6+.......+1/100-1/102
A=1/2-1/102
A=51/102-1/102
A=50/102
A=25/51
tính \(\frac{1}{2.4}+\frac{1}{4.6}+\frac{1}{6.8}+....+\frac{1}{100.102}\)
ai nhanh đúng tick
1. tìm x thuộc N
a) hỗn số: x 3/4 = 21989/7996
b) hỗn số: x 2/x = 83/x
2. tính
S1 = 1 / 2.4 + 1 / 4.6 + 1 / 6.8 + ............ + 1 / 100.102
S2 = 3 / 1.3 + 3 / 3.5 + ....... + 3 / 27.29
Tính
a, 2.4+4.6+6.8+......+100.102
b, 8.10+10.12+12.14+.....+98.100
c, 1.2.3+2.3.4+4.5.6+5.6.7
Tính
A= 1/2.4+1/4.6+1/6.8+.....+1/18.20
tính: 1/2.4 + 1/4.6 + 1/6.8 +...+1/30.32 =?
Tính nhanh:(1/2.4)+(1/4.6)+(1/6.8)+.....+(1/98.100)=
Bài 15 tính tổng a) A= 1/1.2 +1/2.3 +1/3.4 +...+1/2011.2012 b) B= 1/2.4 +1/4.6 + 1/6.8+.,.......+1/2010.2012
Tính tống:
S= 1/2.4 + 1/4.6 + 1/6.8 +...+ 1/2018.2020
S=1/2.4+1/4.6+1/6.8+1/8.10 tính S