四年级数学《简便运算》专项计算题

四年级数学《简便运算》专项计算题


简介:
(1)402-27+198 =(402+198)-27 =600-27 =573 (2)39+261+61 =39+61+261 =100+261 =361 (3)2010×9+2010 =2010×(9+1) =2010×10 =20100 (4)32×25×125 =8×4×25×125 =(4×25)×(125×8) =100×1000 =100000