=3/12+3/60+3/140
=>1/4+1/20+3/140
=>4+20+3/140
=>3363/140
Tuyển Cộng tác viên Hoc24 nhiệm kì 26 tại đây: https://forms.gle/dK3zGK3LHFrgvTkJ6
=3/12+3/60+3/140
=>1/4+1/20+3/140
=>4+20+3/140
=>3363/140
tính nhanh
\(\frac{3}{2.6}+\frac{3}{6.10}+\frac{3}{10.14}\)
\(\frac{4}{1.3.5}+\frac{4}{3.5.7}+\frac{4}{5.7.9}\)
\(\frac{5}{2.4.6}+\frac{5}{4.6.8}+\frac{5}{6.8.10}\)
D=3/2.6+3/6.10+3/10.14+...+3/24.30
Tính
A=3/2.5+3/5.8+3/8.11+...+3/2015.2018
B=4/2.6+4/6.10+4/10.14+...+4/102.106
tính A=\(\frac{1}{6.10}+\frac{1}{10.14}+\frac{1}{14.18}+...+\frac{1}{402.406}\)
T= 2.6+6.10+10.14+.....+102.106
TÍNH:
1/2.6 + 1/6.10 + 1/10.14 + ..... + 1/102.106
Tinh gia tri cac bieu thuc sau
D = \(\frac{1}{6.10}+\frac{1}{10.14}+...+\frac{1}{402.406}\)
E = \(\frac{4}{5.8}+\frac{4}{8.11}+...+\frac{4}{305.308}\)
bai1:tinh tong S=1.3+3.5+5.7+...+99.101
bai2 :tinh tong S=1.4+4.7+7.10+...+2017.2020
bai 3: tinh tong N=2.4+4.6+6.8+..+100.102
bai 4: tinh tóng=2.6+6.10+10.14+14.18+...+42.46+50.54
bai 5:tinh tongB=2^2+4^2+6^2+...+100^2
bai 6:C=1^2+3^2+...+100^2
bai7: biet 1^2+2^2+3^2+...+10^2=385 tinh tong 2^2+4^2+6^2+...+20^2
bai 8: tinh tong s=1^2+2^2+3^2+...+99^2
3/6.2 + 3/6.10 + 3/10.14 + ....+ 3/26.20 hõ trợ mik các bn ơi