( - 12 ) . ( - 13 ) + 13 . ( - 29 )
= \(12.13+13.\left(-29\right)\)
=\(13.\left[12+\left(-29\right)\right]\)
=\(13.\left(-17\right)\)
=\(-221\)
a) (-12).(-13) + 13.(-29)
= 12.13 + 13.(-29)
= 13.(12 - 29)
= 13 . (-17)
=-221
b) -23.63 + 23.21 - 58.23
= -(23.63 - 23.21 + 58.23)
= -23.(63 - 21 + 58)
= -23.100
=-2300
(-12) . (-13) + 13 . (-29)
= 12 . 13 + 13 . (-29)
= 13 . (12 - 29)
= 13 . (-17)
= -221
-23 . 63 + 23 . 21 + (- 58) . 23
= 23 . ( -63 ) + 23 . 21 + (- 58) . 23
= 23.( -63 + 21 - 58 )
= 23. (-100)
= -2300
-23.63+23.21-58.23
= 23. (-63)+23.21-58.23
= 23 . (-63+21-58)
= 23 . (-100)
= -2300
a, ko ghi lại đề
=12.13+13.(-29)
=13.(12-29)
=13.(-17)
=-221
-23.63+23.21-58.23
= 23. (-63)+23.21-58.23
= 23 . (-63+21-58)
= 23 . (-100)
= -2300
a, ko ghi lại đề
=13.(12-29)
=13.(-17)
=-221
