a)
\(\left(\dfrac{9}{25}-2.18\right):\left(3\dfrac{4}{5}+0.2\right)\)
\(=\left(-1.82\right):4=-0.455\)
b) \(\dfrac{5}{18}-1.456:\dfrac{7}{25}+4.5\cdot\dfrac{4}{5}\)
\(=\dfrac{5}{18}-5.2+3.6=-1\dfrac{29}{90}\)
Tính
a) \(\left(\dfrac{9}{25}-2,18\right):\left(3\dfrac{4}{5}+0,2\right)\)
b) \(1\dfrac{4}{23}+\dfrac{5}{21}-\dfrac{4}{23}+0,25+\dfrac{16}{21}\)
Tính giá trị của các biểu thức :
\(A=-5,13:\left(5\dfrac{5}{28}-1\dfrac{8}{9}.1,25+1\dfrac{16}{63}\right)\)
\(B=\left(3\dfrac{1}{3}.1,9+19,5:4\dfrac{1}{3}\right)\left(\dfrac{62}{75}-\dfrac{4}{25}\right)\)
A=[\(\sqrt{64}\)+2\(\sqrt{left(-3\right)^2}\)-7.\(\sqrt{1,69}\)+3\(\sqrt{\dfrac{25}{16}}\):(\(\sqrt{5\dfrac{2^2}{\))
CMR với n thuộc Z, ta có:
\(\left(1+\dfrac{1}{2}\right).\left(1+\dfrac{1}{5}\right).\left(1+\dfrac{1}{9}\right)....\left(1+\dfrac{2}{n^2+3n}\right)< 3\)
Tính :
\(M=\left(2\dfrac{1}{3}+3,5\right):\left(-4\dfrac{1}{6}+3\dfrac{1}{7}\right)+7,5\)
Tính:
a, A=[\(\sqrt{64}\)+2\(\sqrt{\left(-3\right)^2}\)-7.\(\sqrt{1,69}\)+3\(\sqrt{\dfrac{25}{16}}\):(\(\sqrt{5\dfrac{2^2}{3}}\))
tính
A=\(\sqrt{\dfrac{11}{25}+1}-\sqrt{20}\left(\sqrt{\dfrac{1}{80}}-\dfrac{1}{3\sqrt{10}}\right)+\dfrac{1}{6}\)
GIÚP MK CÂU NÀY VỚI:
Tìm x biết:
\(\left(\dfrac{3}{5}-x\right)\cdot\left(\dfrac{2}{5}-x\right)>0\)
nhanh nha.
\(\dfrac{a+b}{3}=\dfrac{b+c}{4}=\dfrac{c+a}{5}\)
Tính a, b, c
