Chương I : Số hữu tỉ. Số thực
Các câu hỏi tương tự
Bài 1: Thực hiện phép tính:
Aleft(-dfrac{1}{125}right)^{11}:left(dfrac{1}{5}right)^{32}
B1+dfrac{1}{3}+left(dfrac{1}{3}right)^2+....+left(dfrac{1}{3}right)^{2018}
Cdfrac{16^3cdot3^{10}+120cdot6^9}{4^6cdot3^{12}+6^{11}}
Dleft(dfrac{0.4-dfrac{2}{9}+dfrac{2}{11}}{1.4-dfrac{7}{9}+dfrac{7}{11}}-dfrac{dfrac{1}{3}-0.25+dfrac{1}{5}}{1dfrac{1}{6}-0.875+0.7}right):dfrac{2017}{2018}
Edfrac{1}{2}+dfrac{1}{6}+dfrac{1}{12}+dfrac{1}{20}+dfrac{1}{30}+dfrac{1}{42}+dfrac{1}{56}+dfrac{1}{72}
Gdfrac{left(dfra...
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Bài 1: Thực hiện phép tính:
\(A=\left(-\dfrac{1}{125}\right)^{11}:\left(\dfrac{1}{5}\right)^{32}\)
\(B=1+\dfrac{1}{3}+\left(\dfrac{1}{3}\right)^2+....+\left(\dfrac{1}{3}\right)^{2018}\)
\(C=\dfrac{16^3\cdot3^{10}+120\cdot6^9}{4^6\cdot3^{12}+6^{11}}\)
\(D=\left(\dfrac{0.4-\dfrac{2}{9}+\dfrac{2}{11}}{1.4-\dfrac{7}{9}+\dfrac{7}{11}}-\dfrac{\dfrac{1}{3}-0.25+\dfrac{1}{5}}{1\dfrac{1}{6}-0.875+0.7}\right):\dfrac{2017}{2018}\)
\(E=\dfrac{1}{2}+\dfrac{1}{6}+\dfrac{1}{12}+\dfrac{1}{20}+\dfrac{1}{30}+\dfrac{1}{42}+\dfrac{1}{56}+\dfrac{1}{72}\)
\(G=\dfrac{\left(\dfrac{2}{5}\right)^7\cdot5^7+\left(2\dfrac{1}{4}\right)^3:\left(\dfrac{3}{16}\right)^3}{512+2^7\cdot5^2}:\dfrac{\left(\dfrac{1}{2}\right)^0}{\left(-1\right)^{2017}}\)
Mn ơi giúp e với ........ Em đang cần gấp giúp e với nha!!
Thank you mn nhiều nhiều.....
Tính nhanh :
\(A=\left(-\dfrac{5}{7}+\dfrac{8}{5}\right):\dfrac{91}{8}+\left(-\dfrac{2}{7}-\dfrac{3}{5}\right):\dfrac{91}{8}\)
\(B=\dfrac{13}{15}:\left(\dfrac{4}{5}-\dfrac{3}{7}\right)+\dfrac{13}{15}:\left(\dfrac{2}{5}-\dfrac{1}{9}\right)\)
(Gíup mình với )
Tính giá trị biểu thức :
A=\(\left[\dfrac{1\dfrac{11}{31}.4\dfrac{3}{7}-\left(15-6\dfrac{1}{3}.\dfrac{2}{19}\right)}{4\dfrac{5}{6}+\dfrac{1}{6}\left(12-5\dfrac{1}{3}\right)}\right].\dfrac{31}{50}\)
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{-...
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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 \(\left(\dfrac{-1}{2}\right)^{400}\)
Thực hiện phép tính
\(\dfrac{4}{9}:\left(\dfrac{-1}{7}\right)+6\dfrac{5}{9}.\left(\dfrac{2}{3}\right)\)
\(\left(\dfrac{-1}{3}\right)^2.\dfrac{4}{11}+\dfrac{7}{11}.\left(\dfrac{-1}{3}\right)^2\)
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 = \(\dfrac{3}{49}\times\dfrac{19}{2}-\dfrac{3}{49}\times\dfrac{5}{2}-\left(\dfrac{1}{20}-\dfrac{1}{4}\right)^2\times\left(\dfrac{-1}{2}-\dfrac{193}{14}\right)\)
a, 1 + dfrac{1}{2}.(1+2)+dfrac{1}{3}.(1+2+3)+...+dfrac{1}{16}.(1+2+3+...+16)b, left[left(dfrac{2}{196}-dfrac{3}{386}right).dfrac{193}{17}+dfrac{33}{34}right]:left[left(dfrac{7}{1931}+dfrac{11}{3862}right).dfrac{1931}{25}+dfrac{9}{2}right]c, dfrac{dfrac{1}{2}-dfrac{1}{7}-dfrac{1}{13}}{dfrac{2}{3}-dfrac{2}{7}-dfrac{2}{13}}xdfrac{dfrac{3}{4}-dfrac{3}{16}-dfrac{3}{64}-dfrac{3}{256}}{1-dfrac{1}{4}-dfrac{1}{16}-dfrac{1}{64}}+dfrac{5}{8}d, dfrac{0,125-dfrac{1}{5}+dfrac{1}{7}}{0,375-dfrac{3}{5}+dfrac{3}...
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a, 1 + \(\dfrac{1}{2}\).(1+2)+\(\dfrac{1}{3}\).(1+2+3)+...+\(\dfrac{1}{16}\).(1+2+3+...+16)
b, \(\left[\left(\dfrac{2}{196}-\dfrac{3}{386}\right).\dfrac{193}{17}+\dfrac{33}{34}\right]\):\(\left[\left(\dfrac{7}{1931}+\dfrac{11}{3862}\right).\dfrac{1931}{25}+\dfrac{9}{2}\right]\)
c, \(\dfrac{\dfrac{1}{2}-\dfrac{1}{7}-\dfrac{1}{13}}{\dfrac{2}{3}-\dfrac{2}{7}-\dfrac{2}{13}}\)x\(\dfrac{\dfrac{3}{4}-\dfrac{3}{16}-\dfrac{3}{64}-\dfrac{3}{256}}{1-\dfrac{1}{4}-\dfrac{1}{16}-\dfrac{1}{64}}\)+\(\dfrac{5}{8}\)
d, \(\dfrac{0,125-\dfrac{1}{5}+\dfrac{1}{7}}{0,375-\dfrac{3}{5}+\dfrac{3}{7}}\)+\(\dfrac{\dfrac{1}{2}+\dfrac{1}{3}-0,2}{\dfrac{3}{4}+0,5-\dfrac{3}{10}}\)
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}
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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 \(\dfrac{-11}{21}\)
1)Tính giá trị biểu thức:
dfrac{left(13dfrac{1}{4}-2dfrac{5}{27}-10dfrac{5}{6}right).230dfrac{1}{25}+46dfrac{3}{4}}{left(1dfrac{3}{7}+dfrac{10}{3}right):left(12dfrac{1}{3}-14dfrac{2}{7}right)}
2)Tìm x biết:
a) 42+dfrac{3}{7}.left|3x-1right|12
b) left|2x-1right|left|x+2right|
c) 2.3^x.3^218 với xin N
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1)Tính giá trị biểu thức:
\(\dfrac{\left(13\dfrac{1}{4}-2\dfrac{5}{27}-10\dfrac{5}{6}\right).230\dfrac{1}{25}+46\dfrac{3}{4}}{\left(1\dfrac{3}{7}+\dfrac{10}{3}\right):\left(12\dfrac{1}{3}-14\dfrac{2}{7}\right)}\)
2)Tìm x biết:
a) \(42+\dfrac{3}{7}.\left|3x-1\right|=12\)
b) \(\left|2x-1\right|=\left|x+2\right|\)
c) \(2.3^x.3^2=18\) với \(x\in N\)