Các câu hỏi tương tự
Tính nhanh:
(1.2+2.3+3.4+....+2012.2013)-(2.2+3.3+4.4+...+2013.2103)
F=(1.1/1.2).(2.2/2.3)(3.3/3.4).(4.4/4.5)
A=1.2+2.3+3.4+4.5+...1999.2000
B=1.1+2.2+3.3+4.4+....1999.1999
C=1.2.3+2.3.4+3.4.5+....+48.49.50
Tính nhanh:
A=1.2+2.3+3.4+4.5+...1999.2000
B=1.1+2.2+3.3+4.4+....1999.1999
C=1.2.3+2.3.4+3.4.5+....+48.49.50
tính nhanh :
1.2 + 2.3 + 3.4 + 4.5 + ..... 1999.2000
1.1 + 2.2 + 3.3 +4.4 + ...1999.1999
1.2.3 + 2.3.4 + 3.4.5 + .... + 1998.1999.2000
giải nhanh giùm mình nha cảm ơn rất nhiều
1.Tim so nguyen to lon nhat co 3 chu so sao cho so do chia het cho a-b; c-d; e-f; a/b=125/35; c/d=144/30;e/f=56/24
2. C=1001. (2/12012+74/555555+2/13.7.11.5)
D=(1.2+2.3+3.4+...+2012.2013)-(2.2+3.3+4.4+...+2013.2013)
3.Tìm số tự nhiên có 6 cs sao cho: abcdef=3.abc.def
4. Cho doan AB=7cm. Tren tia AB lay I sao cho BK=2cm
a. chung minh rang: I nam giua A va K
b. Tinh IK
tính tổng C=1.2+2.3+3.4+...+98.99
rồi sử dụng kết quả tính tổng
a, S=1.99+2.98+3.97+4.96+...97.3+98.2+99.1
b, H=1.1+2.2+3.3+4.4+...+97.97+98.98
2^2.4^4.2^6.2.22.2^3.2^7.2^43^2.33^4.3^3.33.3^5.3^4.3^23.3^6.3^7.3^44.4^34^5.4.4^74.4^3.4^5.4^65.5^65.5^45.5^2.5^45.5^3.5^4.5^65.5^6.5^4.5^3x.x^2x.x^3.x^5a.a^4a.a^2.a^4.a^5.a^7a.a^3.a^5.a^6a^4.a.a^5.a^6.ax.x^3.x^4x^5.x^4.x.x^7.x^67.7^27.7^2.7^4.7^57^3.7^5.7.7^47^2.7.7^6.7^6.7^310.10^210.10^210.100.10^310.100.10^4.100010^2.10^4.100.1000
Đọc tiếp
2^2.4^4.2^6.2.2=
2.2^3.2^7.2^4=
3^2.3=
3^4.3^3.3=
3.3^5.3^4.3^2=
3.3^6.3^7.3^4=
4.4^3=
4^5.4.4^7=
4.4^3.4^5.4^6=
5.5^6
5.5^4=
5.5^2.5^4=
5.5^3.5^4.5^6=
5.5^6.5^4.5^3=
x.x^2
x.x^3.x^5=
a.a^4
a.a^2.a^4.a^5.a^7=
a.a^3.a^5.a^6
a^4.a.a^5.a^6.a=
x.x^3.x^4=
x^5.x^4.x.x^7.x^6=
7.7^2=
7.7^2.7^4.7^5=
7^3.7^5.7.7^4=
7^2.7.7^6.7^6.7^3=
10.10^2=
10.10^2=
10.100.10^3=
10.100.10^4.1000=
10^2.10^4.100.1000=
Tính A-B=...biết A=1.2+2.3+3.4+...+98.99;và B=1+2.2+3.3+...+98.98