so sánh A và B

A=\(\left(\frac{1}{80}\right)^7\)

B=\(\left(\frac{-1}{243}\right)^6\)

Ai nhanh nhất mk k nha 3 cái vì mk có 3 nick nha

so sánh:

a)\(\left(\frac{1}{80}\right)^7và\left(\frac{1}{243}\right)^6\)

b)\(\left(\frac{3}{8}\right)^5và\left(\frac{5}{243}\right)^3\)

giải chi tiết cho mk nha!!!

giúp mk vs làm mãi ko ra mk cảm ơn trc.

a)\(P=\dfrac{\dfrac{42}{31}.\dfrac{31}{7}-\left(1.5-6\dfrac{1}{3}.\dfrac{2}{19}\right)}{4\dfrac{5}{6}+\dfrac{1}{6}.\left(12-5\dfrac{1}{3}\right)}.\left(-1:\dfrac{14}{39}\right)\)

b)\(Q=\left(\dfrac{1}{4}-1\right).\left(\dfrac{1}{9}-1\right).\left(\dfrac{1}{16}-1\right).\left(\dfrac{1}{25}-1\right).....\left(\dfrac{1}{121}-1\right)\)

cho C= \(\left(\dfrac{1}{\sqrt{a}-1}-\dfrac{1}{\sqrt{a}}\right)\div\left(\dfrac{\sqrt{a}+1}{\sqrt{a}-1}-\dfrac{\sqrt{a}+2}{\sqrt{a}-1}\right)\)

a) rút gọn C

b) tìm a để C= \(\dfrac{1}{4}\)

lm nhanh giúp mk nhé mk đang cần gấp 

Cho M= \(\left(x-a\right)\left(x-b\right)+\left(x-b\right)\left(x-c\right)+x^2\)

M the a,b,c biết \(x=\dfrac{1}{2}a+\dfrac{1}{2}b+\dfrac{1}{2}c\)

Ai giups mk vs ai nhanh mk sẽ vote nha

\(A=\left(2\dfrac{1}{3}+3\dfrac{1}{2}\right):\left(-4\dfrac{1}{6}+3\dfrac{1}{7}\right)+7\dfrac{1}{2}\)

\(B=4\dfrac{25}{16}+25\cdot\left(\dfrac{9}{16}:\dfrac{125}{64}\right):\left(-\dfrac{27}{8}\right)\)

giải hộ mk nhanh nhanh nhoa ☺

BT2: Tính nhanh

9) \(\dfrac{98}{99}+\dfrac{89}{100}+\dfrac{100}{101}.\left(\dfrac{1}{12}-\dfrac{1}{3}+\dfrac{1}{4}\right)\)

10) \(\left(\dfrac{78}{79}+\dfrac{79}{80}+\dfrac{80}{81}\right).\left(\dfrac{1}{5}+\dfrac{1}{6}+\dfrac{3}{10}-\dfrac{2}{3}\right)\)

Giúp mk nha!

Cho biểu thức \(A=\dfrac{1}{3}+\left(\dfrac{1}{3}\right)^2+\left(\dfrac{1}{3}\right)^3+...+\left(\dfrac{1}{3}\right)^{2019}+\left(\dfrac{1}{3}\right)^{2020}\). Chứng minh rằng A \(< \dfrac{1}{2}\)

Giúp mk đi, 23h là mk phải nộp rùi

1:So sánh:\(\left(\frac{1}{80}\right)^7\) và\(\left(\frac{1}{243}\right)^6\)

2:So sánh:\(\left(\frac{3}{8}\right)^5\)và\(\left(\frac{5}{243}\right)^3\)

làm nhanh giúp mình nhé!