(1)原式=125×8-40×8
=1000-320
=680 (2)原式=(57+43)×4
=100×4
= 400
(3)原式=27×(99+1)
=27×100
=2700 (4)原式= 48×(100+1)
= 4800+48
= 4848
(1)原式=125×8-40×8
=1000-320
=680 (2)原式=(57+43)×4
=100×4
= 400
(3)原式=27×(99+1)
=27×100
=2700 (4)原式= 48×(100+1)
= 4800+48
= 4848