Chương I : Số hữu tỉ. Số thực
Các câu hỏi tương tự
A left(dfrac{1}{2}-1right)left(dfrac{1}{3}-1right).........left(dfrac{1}{10}-1right). So sánh A với dfrac{-1}{9}B left(dfrac{1}{4}-1right)left(dfrac{1}{9}-1right)...........left(dfrac{1}{100}-1right). So sánh B với dfrac{-11}{21}
Đọc tiếp
A= \(\left(\dfrac{1}{2}-1\right)\)\(\left(\dfrac{1}{3}-1\right)\).........\(\left(\dfrac{1}{10}-1\right)\). So sánh A với \(\dfrac{-1}{9}\)
B= \(\left(\dfrac{1}{4}-1\right)\)\(\left(\dfrac{1}{9}-1\right)\)...........\(\left(\dfrac{1}{100}-1\right)\). So sánh B với \(\dfrac{-11}{21}\)
Cho \(A=\dfrac{10^{101}-1}{10^{102}-1}\) và \(B=\dfrac{10^{100}+1}{10^{101}+1}\)
So sánh A và B
Tính nhanh :
a) A = \(\dfrac{10\dfrac{1}{3}\left(26\dfrac{1}{3}-\dfrac{176}{7}\right)-\dfrac{12}{11}\left(\dfrac{10}{3}-1.75\right)}{\dfrac{5}{\left(91-0.25\right).\dfrac{60}{11}-1}}\)
b) ( 18.123+9.436.2+3.5310.6):(1+4+7+......+100-410)
Cho \(A=1+\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{4}+...+\dfrac{1}{4026}\)và \(B=1+\dfrac{1}{3}+\dfrac{1}{5}+\dfrac{1}{7}+...+\dfrac{1}{4025}\)So sánh với \(1\dfrac{2013}{2014}\)
1 tính
a, -dfrac{2}{3}-left(dfrac{-2}{5}right)-dfrac{7}{10}
b, dfrac{-5}{9}.left(dfrac{3}{10}-dfrac{2}{5}right)
c, left(dfrac{11}{24}:dfrac{55}{36}right).dfrac{10}{3}
d, left(dfrac{1}{2}-1right).left(dfrac{1}{3}-1right)...left(dfrac{1}{2017}-1right)
e,left(dfrac{2}{3}right):left(dfrac{4}{9}right)^{10}
f,left(dfrac{1}{7}right)^7.7^7
g, dfrac{left(125right)^5}{5^{15}}
2 tìm x, biết
a, dfrac{-4}{7}-xdfrac{5}{7}
b, x:left(dfrac{-3}{8}right)dfrac{1}{2}
c, dfrac{-3}{5}+dfrac{1}{4}:xdfrac{-...
Đọc tiếp
1 tính
a, \(-\dfrac{2}{3}-\left(\dfrac{-2}{5}\right)-\dfrac{7}{10}\)
b, \(\dfrac{-5}{9}.\left(\dfrac{3}{10}-\dfrac{2}{5}\right)\)
c, \(\left(\dfrac{11}{24}:\dfrac{55}{36}\right).\dfrac{10}{3}\)
d, \(\left(\dfrac{1}{2}-1\right).\left(\dfrac{1}{3}-1\right)...\left(\dfrac{1}{2017}-1\right)\)
e,\(\left(\dfrac{2}{3}\right):\left(\dfrac{4}{9}\right)^{10}\)
f,\(\left(\dfrac{1}{7}\right)^7.7^7\)
g, \(\dfrac{\left(125\right)^5}{5^{15}}\)
2 tìm x, biết
a, \(\dfrac{-4}{7}-x=\dfrac{5}{7}\)
b, \(x:\left(\dfrac{-3}{8}\right)=\dfrac{1}{2}\)
c, \(\dfrac{-3}{5}+\dfrac{1}{4}:x=\dfrac{-2}{5}\)
d, \(\left(x-\dfrac{2}{5}\right).\left(x+\dfrac{3}{7}\right)=0\)
e, \(\left(x+1\right)^5=-32\)
f, \(x-\left(1,5-7\right)=0,35\)
3 tìm số tự nhiên n biết
a, \(3^n=81\)
b, \(2^n=16\)
c, \(2.2^n=16\)
d, \(2.8^n=128\)
5 so sánh
a, \(2^{333}\) và \(3^{222}\)
b, \(\left(\dfrac{-1}{16}\right)^{100}\) và \(\left(\dfrac{-1}{2}\right)^{400}\)
1. Thực hiện phép tính :
a) dfrac{20^5.5^{10}}{100^5}
b) dfrac{49^6,5-7^{11}}{left(-7right)^{10}.5-2.49^5}
c) dfrac{6^3+3.6^2+3^3}{-13}
d) dfrac{4^6.9^5+6^9.120}{8^4.3^{12}-6^{11}}
e) A 1-dfrac{1}{2}-dfrac{1}{2^2}-dfrac{1}{2^3}-...-dfrac{1}{2^{10}}
2. Cho các biểu thức :
A 3 + 32 + 33 + 34+... + 336
a) C/minh A chia hết cho 4
b) C/minh A chia hết cho 13
c) C/minh A chia hết cho 52
Đọc tiếp
1. Thực hiện phép tính :
a) \(\dfrac{20^5.5^{10}}{100^5}\)
b) \(\dfrac{49^6,5-7^{11}}{\left(-7\right)^{10}.5-2.49^5}\)
c) \(\dfrac{6^3+3.6^2+3^3}{-13}\)
d) \(\dfrac{4^6.9^5+6^9.120}{8^4.3^{12}-6^{11}}\)
e) A = \(1-\dfrac{1}{2}-\dfrac{1}{2^2}-\dfrac{1}{2^3}-...-\dfrac{1}{2^{10}}\)
2. Cho các biểu thức :
A = 3 + 32 + 33 + 34+... + 336
a) C/minh A chia hết cho 4
b) C/minh A chia hết cho 13
c) C/minh A chia hết cho 52
\(\dfrac{\dfrac{-1}{5}+\dfrac{1}{7}+\dfrac{1}{8}}{\dfrac{3}{8}-0,6+\dfrac{3}{7}}+\dfrac{\dfrac{1}{2}+\dfrac{1}{3}-0,2}{\dfrac{3}{4}-\dfrac{3}{10}+\dfrac{1}{2}}\)
Nhờ mọi người giúp nhé
1) A = \(\left(-\dfrac{25}{27}-\dfrac{31}{42}\right)-\left(\dfrac{-7}{27}-\dfrac{3}{42}\right)\)
2) B = \(\dfrac{10\dfrac{3}{10}-\left(9,5-0,25\times18\right)\div0,5}{1\dfrac{1}{5}-1\dfrac{1}{2}}\)
3) C = \(\dfrac{3}{49}\times\dfrac{19}{2}-\dfrac{3}{49}\times\dfrac{5}{2}-\left(\dfrac{1}{20}-\dfrac{1}{4}\right)^2\times\left(\dfrac{-1}{2}-\dfrac{193}{14}\right)\)
1,dfrac{3}{16}- ( x - dfrac{5}{4} ) - ( dfrac{3}{4} + dfrac{-7}{8} - 1 ) 2dfrac{1}{2}2,dfrac{1}{2} . ( dfrac{1}{6} - dfrac{9}{10} ) dfrac{1}{5} - x + ( dfrac{1}{15} - dfrac{-1}{5} )Giúp mik nhanh với ạ
Đọc tiếp
1,\(\dfrac{3}{16}\)- ( x - \(\dfrac{5}{4}\) ) - ( \(\dfrac{3}{4}\) + \(\dfrac{-7}{8}\) - 1 ) = \(2\dfrac{1}{2}\)
2,\(\dfrac{1}{2}\) . ( \(\dfrac{1}{6}\) - \(\dfrac{9}{10}\) ) = \(\dfrac{1}{5}\) - x + ( \(\dfrac{1}{15}\) - \(\dfrac{-1}{5}\) )
Giúp mik nhanh với ạ