a)12x13+12x15+12x72=
=12(13+15+72)
=12x100
= 1200
b)125x234-125x28+125x194=
=125(234-28+194)
=125x400
= 50000
c)702x256-702x55+702x799=
=702(256-55+799)
=702x1000
= 702000
d)1000x372+259x1000-153x1000=
=1000(372+259-153)
=1000x478
= 478000
a) 12×13 + 12×15 + 12×72 =
= 12×(13 + 15 + 72) =
= 12×(28+72) =
= 12×100 =
= 1200
b) 125×234 - 125×28 + 125×194 =
= 125×(234 - 28 + 194) =
= 125×(206 + 194)=
= 125×400 =
= 50000
c) 702×256 - 702×55 + 702×799 =
= 702×(256 - 55 + 799) =
= 702×(201+799) =
= 702×1000 =
= 702000
d) 1000×372 + 259×1000 - 153×1000 =
= 1000×(372 + 259 - 153) =
= 1000×(631 - 153)=
= 1000×478 =
= 478000
