\(101-95+91-85+......+31-25+21-15+11-5\)
\(\Leftrightarrow\left(101-95\right)+\left(91-85\right)+.....+\left(31-25\right)+\left(21-15\right)+\left(11-5\right)\)( 17 CẶP )
\(\Leftrightarrow6+6+....+6+6+6\)
\(\Leftrightarrow6.17=102\)
\(101-95+91-85+......+31-25+21-15+11-5\)
\(\Leftrightarrow\left(101-95\right)+\left(91-85\right)+.....+\left(31-25\right)+\left(21-15\right)+\left(11-5\right)\)( 17 CẶP )
\(\Leftrightarrow6+6+....+6+6+6\)
\(\Leftrightarrow6.17=102\)
Tính 101-95 + 91-85 +\ldots + 31-25 + 21-15 + 11-5 =101−95+91−85+…+31−25+21−15+11−5= Câu 10
101−95+91−85+…+31−25+21−15+11−5=?
Tính: 101 - 95 + 91 - 85 + ...... + 31 - 25 + 21 - 15 + 11 - 5 =
tính 101 - 95 + 91 - 85 + .... .+ 31 - 25 + 21 - 15 + 11 - 5 = ....
tính:101-95+91-85+....+31-25+21-15+11+5=...
101-95+91-85 ...41-35+31-25+21-15+11-5
Tính 101-95+91-85 +........+ 31-25+21-15+11-5 =................
Cho dãy số:101+95+91-85+81....31-25+21-15+11-5=
Tính .
101- 95 + 91 - 85 + ..... + 31 - 25 + 21 - 15 + 11 - 5 : ..........