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 \(\left(\dfrac{-1}{2}\right)^{400}\)
