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(x-2345)*5=2550
(x-2345) = 2550 : 5
(x-2345) = 510
x = 510 + 2345
x = 2.855
Vậy......
\(\left(x+\frac{1}{2\cdot3}\right)+\left(x+\frac{1}{3\cdot4}\right)+....+\left(x+\frac{1}{15\cdot16}\right)=\frac{39}{16}\)
\(\Leftrightarrow\left(x+x+x+....+x\right)+\left(\frac{1}{2\cdot3}+\frac{1}{3\cdot4}+....+\frac{1}{15\cdot16}\right)=\frac{39}{16}\)
\(\Leftrightarrow14x+\left(\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+....+\frac{1}{15}-\frac{1}{16}\right)=\frac{39}{16}\)
\(\Leftrightarrow14x+\left(\frac{1}{2}-\frac{1}{16}\right)=\frac{39}{16}\)
\(\Leftrightarrow14x+\frac{7}{16}=\frac{39}{16}\)
\(\Leftrightarrow14x=2\)
\(\Leftrightarrow x=\frac{1}{7}\)
\(\left(x-2345\right).5=2550\)
\(\left(x-2345\right)=2550:5\)
\(x=510+2345\)
\(x=2855\)
\(x\div\frac{1}{2}+x\div\frac{1}{4}+x\div\frac{1}{8}+x=960\)
\(x\times2+x\times4+x\times8+x=960\)
\(x\times\left(2+4+8+1\right)=960\)
\(x\times15=960\)
\(x=960\div15\)
\(x=64\)
Bài 1 :
X x 405 = 86265 89658 : X = 293
X = 86265 : 405 X = 89658 : 293
X = 213 X = 306
x +\(\frac{1}{6}\)=\(\frac{1}{3}\)-\(\frac{1}{4}\)
x +\(\frac{1}{6}\)=\(\frac{1}{12}\)
x =\(\frac{1}{12}\)-\(\frac{1}{6}\)
x =\(-\frac{1}{12}\)
x -\(\frac{5}{12}\)=\(\frac{1}{3}+\frac{1}{4}\)
x -\(\frac{5}{12}\)=\(\frac{7}{12}\)
x =\(\frac{7}{12}\)+\(\frac{5}{12}\)
x = 1
x +\(\frac{1}{2}\)=\(\frac{4}{5}\)
x =\(\frac{4}{5}\)-\(\frac{1}{2}\)
x =\(\frac{3}{10}\)
x -\(\frac{1}{6}\)=\(\frac{1}{2}\)+\(\frac{1}{3}\)
x -\(\frac{1}{6}\)=\(\frac{5}{6}\)
x =\(\frac{5}{6}\)+\(\frac{1}{6}\)
x = 1
x +\(\frac{1}{8}\)=\(\frac{1}{2}\)-\(\frac{1}{3}\)
x +\(\frac{1}{8}\)=\(\frac{1}{6}\)
x =\(\frac{1}{6}\)-\(\frac{1}{8}\)
x =\(\frac{1}{24}\)
Học tốt!!!
a, x < 148 x 4 : 184 = 4
b, x:5 = 1798 - 246 = 1552
x = 1552 x 5 = 7760
k mk nha
a, 148 x X < 148 x 4
Suy ra x < 4
Suy ra x = 1; 2; 3
b, X : 5 + 246 = 1798
X : 5 = 1 798 - 246
X : 5 = 1552
x = 1552 x 5
x = 7760
P/s tham khao nha
x= 342154:9
x= \(\frac{342154}{9}\)
Vậy x= \(\frac{342154}{9}\)
Ta có : (x + 1) x X = 2550
=> (X + 1) x X = 50 x 51
=> X = 50