29. (19-13) - 19( 29-13)
= 29.19 - 13.29 - 19.29 - 13.19
= 29( 19-19) - 13.29 - 13.19
= 0 - 13. (29-19)
= 0- 13.10
= 0 -130
= -130
29 x ( 19 - 13 ) - 19 x ( 29 - 13 )= tự tính
Trả lời:
\(29\left(19-13\right)-19\left(29-13\right)\)
\(=(29.19-29.13)-(19.29-19.13)\)
\(=29.19-29.13-29.19+19.13\)
\(=\left(29.19-29.19\right)-\left(29.13-19.13\right)\)
\(=0-13.\left(29-19\right)\)
\(=-13.10\)
\(=-130\)
Hok tốt!
Good girl
