Răspuns :
(257 - 17) x 10
=
240 x 10 = 2400
(257 - 17) x 10 =
257 x 10 - 17 x 10=
2570 - 170 = 2400
240 x 10 = 2400
(257 - 17) x 10 =
257 x 10 - 17 x 10=
2570 - 170 = 2400
(257-17)×10
=240×10
=2400
(257-17)×10
=(257×10)-(10×17)
=2570-170
=2400