352/117/119-4/117*713/119-5/(117*119)+8/39
Tính giá trị của biểu thức
A=3×1/117×1/119-4/117×713/119-5/117×119+8/39
\(A=3\cdot\dfrac{1}{117}-\dfrac{1}{119}-\dfrac{4}{117}\cdot\dfrac{713}{119}-\dfrac{5}{177}\cdot119+\dfrac{8}{39}\)
\(=\dfrac{1}{39}-\dfrac{1}{119}-\dfrac{2852}{13923}-\dfrac{595}{117}+\dfrac{8}{39}\)
\(=-\dfrac{778}{153}\)
Tính
3*1/117*1/119-4/117*5*4/117*5*118/119-5/117*119+8/39
Tính:3*1/117*1/119-4/117*5*118/119-5/117*118+8/39.
3*1/117*1/119-4/117*5*118/119-5/117*118+8/39.
Giúp mình nhá,cần gấp!
3*1/117*1/119-4/117*5*118/119-5/117*118+8/39
Tính A = \(3.\frac{1}{117}.\frac{1}{119}-\frac{4}{117}.5.\frac{118}{119}-\frac{5}{117}.\frac{1}{119}+\frac{8}{39}\)
Đặt: \(\frac{1}{117}=a,\frac{1}{119}=b\)
Khi đó: \(A=3ab-4a.5.118b-5ab+\frac{8}{39}\)
\(=-2362ab+\frac{8}{39}\)
\(=-2362.\frac{1}{117}.\frac{1}{119}=\frac{38}{1071}\)
\(Tính:A=3\frac{1}{117}\times\frac{1}{119}-\frac{4}{117}\times5\frac{118}{119}-\frac{5}{117\times119}+\frac{8}{39}\)
3*1/117*1/119-4/117*5*118/119-5/117*118+8/39
Tính giá trị A= \(3\dfrac{1}{117}.\dfrac{1}{119}-\dfrac{4}{117}.5\dfrac{118}{119}-\dfrac{5}{117.119}+\dfrac{8}{39}\)
Ta có: \(A=3\dfrac{1}{117}\cdot\dfrac{1}{119}-\dfrac{4}{117}\cdot5\dfrac{118}{119}-\dfrac{5}{117\cdot119}+\dfrac{8}{39}\)
\(=\dfrac{352}{117}\cdot\dfrac{1}{119}-\dfrac{4}{117}\cdot\dfrac{713}{119}-\dfrac{5}{117\cdot119}+\dfrac{8}{39}\)
\(=\dfrac{352-2852-5}{117\cdot119}+\dfrac{8}{39}\)
\(=\dfrac{-835}{4641}+\dfrac{8}{39}\)
\(=\dfrac{3}{119}\)
Tính giá trị biểu thức
D=3x^2(5x^2-4)+x^2(8-15x^2)-8x với |x|=3
F=(3+1/117). 1/119-4/117.(5+118/119)-5/119+8/39