mình cần gấp cảm ơn ạ
\(5.\) \(2+6+10+14+18+22+26+30+34\)
\(=\left(22+18\right)+\left(5+34\right)+\left(10+30\right)+\left(14+26\right)+2\)
\(=40+40+40+40+2=162.\)
\(6.\) \(3+8+13+18+23+28+33+38+43\)
\(=\left(3+13+23+33+43\right)+\left(8+18+28+38\right)\)
\(=115+92=207.\)
\(7.\) \(5+8+11+14+17+20+23+26+29\)
\(=\left(11+29\right)+\left(14+26\right)+\left(17+23\right)+\left(5+8+20\right)\)
\(=40+40+40+33=153.\)
\(8.\) \(7+11+15+19+23+27+31+35+39+43+47\)
\(=\left(11+38\right)+\left(19+31\right)+\left(15+35\right)+\left(7+43\right)+\left(23+47\right)+27\)
\(=50+50+50+50+70+27=297.\)
\(9.\) \(1+6+11+16+21+31+36+41+46+51\)
\(=\left(1+11+21+31+41+51\right)+\left(6+16+26+36+46\right)\)
\(=156+130=286.\)
\(10.\) \(4+10+16+22+28+34+40+46+52+58+64\)
\(=\left(4+46\right)+\left(10+40\right)+\left(16+34\right)+\left(22+58\right)+\left(28+52\right)+64\)
\(=50+50+50+80+80+64=374.\)
\(11.\) \(10+13+16+19+22+25+28+31+34+37+40\)
\(=\left(10+40\right)+\left(13+37\right)+\left(16+34\right)+\left(19+31\right)+\left(22+28\right)+25\)
\(=50+50+50+50+50+25=275.\)
Các Bạn Gíup mình vs ạ, mình đang cần khá gấp, cảm ơn ạ
