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\(66+66+66+66+6+6+6+6+6+5\)
\(=66.4+6.5+5\)
\(=264+30+5\)
\(=294+5\)
\(=299\)
\(the\)
( 132 * 6 - 66 * 12 ) * ( 132 * 6 + 66 )
= ( 12 * 11 * 6 - 6 * 11 * 12 ) * ( 132 * 6 + 66 )
= 0 * ( 132 * 6 + 66 )
= 0
a, 1008 + 1008 + 1008 + 1008 + 1008 - 1008 × 5
=1008x5-1008x5
=1008x(5-5)
=1008x0
=0
b,66-6+6+6+6+6+6+6+6+6+6
=66-6x10
=66-60
=6
\(\frac{1}{6}\cdot\frac{1}{66}\cdot\frac{1}{176}\)
\(=\frac{1}{1\cdot6}+\frac{1}{6\cdot11}+\frac{1}{11\cdot16}\)
\(=\frac{1}{5}\left(\frac{5}{1\cdot6}+\frac{5}{6\cdot11}+\frac{5}{11\cdot16}\right)\)
\(=\frac{1}{5}\left(1-\frac{1}{6}+\frac{1}{6}-\frac{1}{11}+\frac{1}{11}-\frac{1}{16}\right)\)
\(=\frac{1}{5}\left(1-\frac{1}{16}\right)\)
\(=\frac{1}{5}\cdot\frac{15}{16}\)
\(=\frac{3}{16}\)
=))
\(\frac{1}{6}+\frac{1}{66}+\frac{1}{176}\)
\(=\frac{1}{1\times6}+\frac{1}{6\times11}+\frac{1}{11\times16}\)
\(=\frac{1}{5}\times\left(\frac{5}{1\times6}+\frac{5}{6\times11}+\frac{5}{11\times16}\right)\)
\(=\frac{1}{5}\times\left(1-\frac{1}{6}+\frac{1}{6}-\frac{1}{11}+\frac{1}{11}-\frac{1}{16}\right)\)
\(=\frac{1}{5}\times\left(1-\frac{1}{16}\right)\)
\(=\frac{1}{5}\times\frac{15}{16}\)
\(=\frac{3}{16}\)
\(6+66+...+66666666\)\(=6x\left(1+11+111+...+11111111\right)\)
\(=6x12345678\)
Tương tự ta có \(5+55+...+55555555=5x12345678\)
=6474 . chucs banj hocj toots
=6474
Ahihi