问题
解答题
用简便方法计算下面各题
|
答案
①125×7×8
=(125×8)×7
=1000×7
=7000;
②25×(4×98)
=(25×4)×98
=100×98
=9800;
③(675+321)+325
=(675+325)+321
=1000+321
=1321;
④(31×5)×(2×7)
=(31×7)×(5×2)
=217×10
=2170;
⑤125×4×8×25
=(125×8)×(4×25)
=1000×100
=100000;
⑥229+137+171+363
=(229+171)+(137+363)
=400+500
=900.