B= 43.57× 2.6×(630_315×2)
tính nhanh
40,2* 8,1*48/0.048*0.81
b.393*2004+2005*677
mong các bạn giúp đỡ
Tính nhanh
A=43.57*2.6*(630315*2)
Tính :
a, \(\frac{1978.1979+1980.21+1958}{1980.1979-1978.1979}\)
b, \(\frac{5^2.6^{11}.16^2+6^2.12^6.15^2}{2.6^{12}.10^4-81^2.960^3}\)
125 + 2.[56 – 48 : (14 – 2.6)2]
125+2. [56-48:(14-2.6).2]
=125+2. [56-48:(14-12).2]
=125+2 [56-48:2.2]
=125+2 [56-48:4]
=125+2 [56-12]
=125+2 .44
=125+88
=213
125+2. [56-48:(14-2.6).2]
=125+2. [56-48:(14-12).2]
=125+2 [56-48:2.2]
=125+2 [56-48:4]
=125+2 [56-12]
=125+2 .44
=125+88
=213
125+2. [56-48:(14-2.6).2]
=125+2. [56-48:(14-12).2]
=125+2 [56-48:2.2]
=125+2 [56-48:4]
=125+2 [56-12]
=125+2 .44
=125+88
=213
TÍNH
a) \(\frac{5^2.6^{11}.16^2+6^2.12^6.15^2}{2.6^{12}.10^4-81^2.960^3}\)
b)\(\frac{25^8+25^{24}+...+25^4+1}{25^{30}+25^{28}+...+25^2+1}\)
A,tính nhanh \(\frac{1978.1979+1980.21+1958}{1980.1979-1978.1979}\)
B,rút gọn \(\frac{5^2.6^{11}.16^2+6^2.12^6.15^2}{2.6^{12}.10^4-81^2.960^1}\)
A, =1000
B, =\(\frac{101}{1440}\)
So sánh
\(\left(\frac{9}{11}-0.81\right)^{2005}......\frac{1}{10^{4010}}\)
\(\left(\frac{9}{11}-0,81\right)^{2005}=\left(\frac{9}{1100}\right)^{2005}=0,00\left(81\right)^{2005}\)
\(\frac{1}{10^{4010}}=\frac{1}{100^{2005}}=\left(\frac{1}{100}\right)^{2005}=0,01^{2005}\)
Vì 0,00(81)<0,01 nên \(\left(\frac{9}{11}-0,81\right)^{2005}< \frac{1}{10^{4010}}\)
tìm n thuộc N biết :
a)3.5^n+2+4.5^n-3=19.5^10
b)11.6^x-1+2.6^x-1=11.6^11+2.6^13
c)\(\frac{2^{4-x}}{16^5}=32^6\)
a)Tính nhanh: \(\frac{1978.1979+1980.21+1958}{1980.1979-1978.1979}\)
b)Rút gọn: \(\frac{5^2.6^{11}.16^2+6^2.12^6.15^2}{2.6^{12}.10^4-81^2.960^3}\)