\(343:7^2=7^3:7^2=7^{\left(3-2\right)}=7^1=7\)
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Tính nhanh
A=182.[1+1/3+1/9+1/27/2+2/3+2/9+2/27:4-4/7-4/49-4/343/1-1/7-1/49-1/343]=919191/808080
Tính tổng sau: A = 7 + (-10) + 13 + (-16)+ … + 343 + (-346) + 349
tính
a) 75 : 73 - 343 :7
Bài 2 Tìm x
a) 3x : 32 = 343
b) x15 = x
c) 2x . 64 =26
Tính \(\left(\frac{1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}}{2+\frac{2}{3}+\frac{2}{9}+\frac{2}{27}}\div\frac{4-\frac{4}{7}+\frac{4}{49}-\frac{4}{343}}{1-\frac{1}{7}+\frac{1}{49}-\frac{1}{343}}\right)\div\frac{919191}{808080}\)
Tính A = 1 -\(\frac{1}{7}\)+\(\frac{1}{49}\)-\(\frac{1}{343}\)
B = 4 -\(\frac{4}{7}\)+\(\frac{4}{49}\)-\(\frac{4}{343}\)
Tính:
\(A=182\left(\frac{1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}}{2+\frac{2}{3}+\frac{2}{9}+\frac{2}{27}}:\frac{4-\frac{4}{7}+\frac{4}{79}-\frac{4}{343}}{1-\frac{1}{7}+\frac{1}{49}-\frac{1}{343}}\right):\frac{91919191}{80808080}\)
Tính:
\(182.\left[\frac{1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}}{2+\frac{2}{3}+\frac{2}{9}+\frac{2}{27}}:\frac{4-\frac{4}{7}+\frac{4}{9}-\frac{4}{343}}{1-\frac{1}{7}+\frac{1}{49}-\frac{1}{343}}\right]:\frac{919191}{808080}\)
Tính nhanh:\(\left(\frac{1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}}{2+\frac{2}{3}+\frac{2}{9}+\frac{2}{27}}:\frac{4-\frac{4}{7}+\frac{4}{49}+\frac{4}{343}}{1-\frac{1}{7}-\frac{1}{49}-\frac{1}{343}}\right):\frac{91919191}{80808080}\)
B = \(\frac{1+\frac{1}{3}+\frac{1}{9}+\frac{1}{27}}{2+\frac{2}{3}+\frac{2}{9}+\frac{2}{27}}\) :\(\frac{4+\frac{4}{7}+\frac{4}{49}+\frac{4}{343}}{1+\frac{1}{7}+\frac{1}{49}-\frac{1}{343}}\)
Tính nhanh
Ai Nhanh tk
Tính :
\(\left(\frac{1-\frac{1}{3}+\frac{1}{9}+\frac{1}{21}}{2+\frac{2}{3}+\frac{2}{9}+\frac{2}{27}}:\frac{4-\frac{4}{7}+\frac{4}{49}-\frac{4}{343}}{1-\frac{1}{7}+\frac{1}{49}-\frac{1}{343}}\right):\frac{919191}{808080}\)