a)
= -\(\dfrac{45.5}{25}\) : ( \(3\dfrac{4}{5}\)+ 0.2)
= -\(\dfrac{45.5}{25}\) : 4
= -1,82 : 4
= - 0,455
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Bài 12: Số thực
Các câu hỏi tương tự
Thực hiện các phép tính :
a) \(\left(\dfrac{9}{25}-2,18\right):\left(3\dfrac{4}{5}+0,2\right)\)
b) \(\dfrac{5}{18}-1,456:\dfrac{7}{25}+4,5.\dfrac{4}{5}\)
Tính giá trị của các biểu thức :
\(A=-5,13:\left(5\dfrac{5}{28}-1\dfrac{8}{9}.1,25+1\dfrac{16}{63}\right)\)
\(B=\left(3\dfrac{1}{3}.1,9+19,5:4\dfrac{1}{3}\right)\left(\dfrac{62}{75}-\dfrac{4}{25}\right)\)
CMR với n thuộc Z, ta có:
\(\left(1+\dfrac{1}{2}\right).\left(1+\dfrac{1}{5}\right).\left(1+\dfrac{1}{9}\right)....\left(1+\dfrac{2}{n^2+3n}\right)< 3\)
A=[\(\sqrt{64}\)+2\(\sqrt{left(-3\right)^2}\)-7.\(\sqrt{1,69}\)+3\(\sqrt{\dfrac{25}{16}}\):(\(\sqrt{5\dfrac{2^2}{\))
Tính :
\(M=\left(2\dfrac{1}{3}+3,5\right):\left(-4\dfrac{1}{6}+3\dfrac{1}{7}\right)+7,5\)
tính
A=\(\sqrt{\dfrac{11}{25}+1}-\sqrt{20}\left(\sqrt{\dfrac{1}{80}}-\dfrac{1}{3\sqrt{10}}\right)+\dfrac{1}{6}\)
Tìm x
a) 2.(4 x - 30 ) -3 (x + 5) + 4( x - 10 ) 5 (x + 2)
b) dfrac{11}{12}- ( dfrac{2}{5} + x ) dfrac{2}{3} . ( 6 x + 1)
c) dfrac{7}{3}- ( 2 x - dfrac{1}{3} ) ( -2dfrac{1}{6} + 1dfrac{1}{2} ) : 0,25
d) 0,75 + dfrac{5}{9} : x 5dfrac{1}{2}
Đọc tiếp
Tìm x
a) 2.(4 x - 30 ) -3 (x + 5) + 4( x - 10 ) = 5 (x + 2)
b) \(\dfrac{11}{12}\)- ( \(\dfrac{2}{5}\) + x ) = \(\dfrac{2}{3}\) . ( 6 x + 1)
c) \(\dfrac{7}{3}\)- ( 2 x - \(\dfrac{1}{3}\) ) = ( \(-2\dfrac{1}{6}\) + \(1\dfrac{1}{2}\) ) : 0,25
d) 0,75 + \(\dfrac{5}{9}\) : x = \(5\dfrac{1}{2}\)
Tính:
a, A=[\(\sqrt{64}\)+2\(\sqrt{\left(-3\right)^2}\)-7.\(\sqrt{1,69}\)+3\(\sqrt{\dfrac{25}{16}}\):(\(\sqrt{5\dfrac{2^2}{3}}\))
\(\dfrac{a+b}{3}=\dfrac{b+c}{4}=\dfrac{c+a}{5}\)
Tính a, b, c