Tính:
\(A=\frac{4^5.13+32^2.65}{4^4.104}\)
TOÁN VUI
Tính
\(\frac{1}{3.5}+\frac{4}{5.13}+\frac{2}{13.17}+\frac{3}{17.23}+\frac{5}{23.33}\)
Thực hiện phép tính một cách hợp lí nhất:
\(\frac{1}{3.5}+\frac{4}{5.13}+\frac{2}{13.17}+\frac{3}{17.23}+\frac{5}{23.33}\)
(Các bn ghi rõ lời giải giúp mình nhé! Cảm ơn các bn)
tính tổng
\(A=\frac{1}{1.2}+\frac{2}{1.3}+\frac{3}{2.5}+\frac{5}{3.8}+\frac{8}{5.13}+\frac{13}{8.21}+...+\frac{987}{610.1597}\)
\(B=\frac{2^2}{1.3}+\frac{3^2}{2.4}+\frac{4^2}{3.5}+...+\frac{2017^2}{2016.2018}\)
\(C=\frac{5}{1.2.3}+\frac{8}{2.3.4}+\frac{11}{3.4.5}+...+\frac{6025}{2011.2012.2013}\)
bạn phải cho ra 2 số cuối thì mới làm đc nha có 1 s
ố cuối ko làm đc đâu
A= 1-1/2 + 1-1/3 + 1/2-1/5 + 1/3-1/8+ 1/5-1/13+1/8- 1/21 +....+ 1/610- 1/1597
A= 1/610
1/610 nha bn
k giùm mk nha các bn
>_< học tốt
Tính: \(A=\left(1+\frac{4}{5}\right)\left(1+\frac{4}{12}\right)\left(1+\frac{4}{21}\right)\left(1+\frac{4}{32}\right)...\left(1+\frac{4}{24021}\right)\)
b, 32+5.13-3.23
c,12.5+12.95
32 + 5. 13 - 3 . 23
= 32 + 5 .13 - 3 . 8
= 32 + 65 - 24
= 97 + 24
= 121
12.5 + 12 . 95
= 12 . ( 5 + 95 )
= 12 . 100
= 1200
b, 32+5.13-3.2^3
=32+45-3.8
=32+45+24
=97+24
=121
c,12.5+12.95
=12.(5+95)
=12.100
=1200
b)32+5.13-3.23
=32+65-3.8
=32+65-24
=97-24
=73
tk nha, mình tk lại
\(\frac{-11^5.13^7}{11^5.13^8}\) bài rút gọn
Rút gọn:
\(\frac{-11^5.13^7}{11^5.13^8}\)
\(\frac{-11^5.13^7}{11^5.13^8}=\frac{-11^4.\left(-11\right).13^7}{11^4.11.13^7.13}=\frac{-11}{11.13}=\frac{-11}{143}\)
bằng -1/13
ko tik xui nguyên năm gán chịu
Rút gọn phân số sau
\(\frac{1989.1990+3978}{1992.1991+3984}\)
\(\frac{3^{10}.\left(-5\right)^{21}}{\left(-5\right)^{20}.3^{12}}\) \(\frac{-11^5.13^7}{11^5.13^8}\)
\(\frac{2^{10}.3^{10}-2^{10}.3^9}{2^9.3^{10}}\)
\(\left(-\right)\frac{1989\cdot1990+3970}{1992\cdot1991+3984}=\frac{1989\cdot\left(1990+2\right)}{1992\cdot\left(1991+2\right)}=\frac{1989}{1993}\)
\(\left(-\right)\frac{3^{10}\cdot\left(-5\right)^{21}}{\left(-5\right)^{20}\cdot3^{12}}=\frac{3^{10}\cdot\left(-5\right)^{20}\cdot\left(-5\right)}{3^{10}\cdot\left(-5\right)^{20}\cdot3^2}=-\frac{5}{9}\)
\(\left(-\right)\frac{\left(-11\right)^5\cdot13^7}{11^5\cdot13^8}=\frac{11^5\cdot13^7\cdot\left(-1\right)}{11^5\cdot13^7\cdot13}=-\frac{1}{13}\)
\(\left(-\right)\frac{2^{10}\cdot3^{10}-2^{10}\cdot3^9}{2^9\cdot3^{10}}=\frac{2^{10}\cdot3^9\left(3-1\right)}{2^9\cdot3^{10}}=\frac{2^{11}\cdot3^9}{2^9\cdot3^{10}}=\frac{4}{3}\)
Tính :
\(A=\frac{4^5x13+32^2x65}{4^4x104}\)
\(A=\dfrac{2^{10}\cdot13+2^{10}\cdot65}{2^8\cdot2^3\cdot13}=\dfrac{2^{11}\cdot3\cdot13}{2^{11}\cdot13}=3\)