(1+2+.........+50) x (131313 x 34-13 x 343434)
=(1+2+....+50) x (10101 x 13 x 34-13 x 34 x 10101)
=(1+2+3+.......+50) x 0
=0
(1+2+3+...+50)x(131313x34-13x343434)
=(1+2+3+...+50)x(13x10101x34-13x343434)
=(1+2+3+...+50)x(13x343434-13x343434)
=(1+2+3+...+50)x0
=0
(1+2+3+............+50)×(131313×34-13×343434) = (1+2+3+......+50)×(131313×34-13×343434)
=(1+2+3+...+50)×(13×10101×34-13×10101×34) (Vì 131313=10101×13 ;343434=10101×34)\(\)
=(1+2+3+...+50)×0
=0
(1+2+3+............+50)×(131313×34-13×343434)=\(\left(1+2+3.....+50\right)\times\left(131313\times34-13\times343434\right)\)
= (1+2+3+...+50) × \(\left(13\times10101\times34-13\times34\times10101\right)\)
=\(\left(1+2+3+....+50\right)\times0\) =\(0\)
(1+2+3+............+50)×(131313×34-13×343434)=\(\left(1+2+3.....+50\right)\times\left(131313\times34-13\times343434\right)\)
= (1+2+3+...+50) × \(\left(13\times10101\times34-13\times34\times10101\right)\)
=\(\left(1+2+3+....+50\right)\times0\) =\(0\)