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11 x 10 - 10 x 9 + 9 x 8 - 8 x 7 + 7 x 6 - 6 x 5 + 5 x 4 - 4 x 3 + 3 x 2 - 2 x 1 = 60
1+2+3+4+5+6+7+8+9+...........+99=X+1+2+3+4+5+6+7+8+9+.................+99
4950=4950+X
X=4950-4950
X=0
a) \(3\left(\frac{x-3}{4}\right)=6.\frac{3}{8}\)
\(\Leftrightarrow\frac{3x-9}{4}=\frac{18}{8}\)
\(\Leftrightarrow\left(3x-9\right).8=18.4\)
\(\Leftrightarrow24x-72=72\)
\(\Leftrightarrow24x=144\)
\(\Leftrightarrow x=\frac{144}{24}\)
\(\Leftrightarrow x=6\)
b) \(\frac{1}{2}.\left(x+\frac{1}{2}\right).\frac{1}{3}=\frac{3}{4}\)
\(\Leftrightarrow\frac{1}{6}.\left(x+\frac{1}{2}\right)=\frac{3}{4}\)
\(\Leftrightarrow\frac{1}{6}x+\frac{1}{12}=\frac{3}{4}\)
\(\Leftrightarrow\frac{1}{6}x=\frac{2}{3}\)
\(\Leftrightarrow x=\frac{2}{3}.\frac{6}{1}\)
\(\Leftrightarrow x=4\)
\(x-\frac{3}{4}=6\times\frac{3}{8}\)
\(\Leftrightarrow x-\frac{3}{4}=\frac{9}{4}\)
\(\Leftrightarrow x=\frac{9}{4}+\frac{3}{4}\)
\(\Leftrightarrow x=3\)
\(\frac{7}{8}:x=3-\frac{1}{2}\)
\(\Leftrightarrow\frac{7}{8}:x=\frac{5}{2}\)
\(\Leftrightarrow x=\frac{7}{8}:\frac{5}{2}\)
\(\Leftrightarrow x=\frac{7}{20}\)
\(x+\frac{1}{2}\times\frac{1}{3}=\frac{3}{4}\)
\(\Leftrightarrow x+\frac{1}{6}=\frac{3}{4}\)
\(\Leftrightarrow x=\frac{3}{4}-\frac{1}{6}\)
\(\Leftrightarrow x=\frac{7}{12}\)
\(x-\frac{3}{4}=6\times\frac{3}{8}\) \(\frac{7}{8}\div x=3-\frac{1}{2}\)
\(x-\frac{3}{4}=\frac{9}{4}\) \(\frac{7}{8}\div x=\frac{3}{2}\)
\(x=\frac{9}{4}-\frac{3}{4}\) \(x=\frac{7}{8}\div\frac{3}{2}\)
\(x=\frac{3}{2}\) \(x=\frac{7}{12}\)
\(x+\frac{1}{2}\times\frac{1}{3}=\frac{3}{4}\)
\(x+\frac{1}{6}=\frac{3}{4}\)
\(x=\frac{3}{4}-\frac{1}{6}\)
\(x=\frac{7}{12}\)
K cho mk nha
a) 2 x 2 x 2 x ... x 2 x 2 :2
b) 3 x 3 x 3 x ... x 3 x 3 :3
c) 4 x 4 x 4 x ... x 4 x 4 :4
d) 5 x 5 x 5 x ... x 5 x 5 :5
e) 6 x 6 x 6 x ... x 6 x 6 :6
g) 7 x 7 x 7 x...x 7 x 7 :7
h) 8 x 8 x 8 x... x 8 x 8 :8
i) 9 x 9 x 9 x...x 9 x 9 :9
a)\(\frac{5}{6}+\frac{3}{4}x=3\Leftrightarrow\frac{3}{4}x=\frac{13}{6}\Leftrightarrow x=\frac{26}{9}\)
b)\(\frac{8}{x}\cdot\frac{3}{4}=\frac{9}{10}\Leftrightarrow\frac{8}{x}=\frac{6}{5}\Leftrightarrow x=\frac{8\cdot5}{6}=\frac{20}{3}\)
c)\(3\cdot\left(x+\frac{1}{2}\right)-\frac{1}{3}=\frac{2}{5}\Leftrightarrow3\left(x+\frac{1}{2}\right)=\frac{11}{15}\Leftrightarrow x+\frac{1}{2}=\frac{11}{45}\Leftrightarrow x=-\frac{23}{90}\)
d)\(\frac{1}{4}+\frac{x}{3}=\frac{5}{6}\Leftrightarrow\frac{x}{3}=\frac{7}{12}\Leftrightarrow x=\frac{7\cdot3}{12}=\frac{7}{4}\)
Bạn ơi , cái dấu hai chiều là sao ? trả lời nhanh cho mình nhé !