问题
解答题
用简便方法计算下面各题.
|
答案
①25×32×1.25,
=(25×4)×(8×1.25),
=100×10,
=1000;
②0.25×39+0.25,
=0.25×(39+1),
=0.25×40,
=10;
③36×8.7+3.6×13,
=36×8.7+36×1.3,
=36×(8.7+1.3),
=36×10,
=360.
用简便方法计算下面各题.
|
①25×32×1.25,
=(25×4)×(8×1.25),
=100×10,
=1000;
②0.25×39+0.25,
=0.25×(39+1),
=0.25×40,
=10;
③36×8.7+3.6×13,
=36×8.7+36×1.3,
=36×(8.7+1.3),
=36×10,
=360.