问题
解答题
用简便方法计算下面各题.
(1)12.3-2.47-3.53
(2)212×7+188×7
(3)125×(4×8)×25
(4)101×63.
答案
(1)12.3-2.47-3.53
=12.3-(2.47+3.53)
=12.3-6
=6.3
(2)212×7+188×7
=(212+188)×7
=400×7
=2800
(3)125×(4×8)×25
=(125×8)×(25×4)
=1000×100
=100000
(4)101×63
=(100+1)×63
=100×63+1×63
=6300+63
=6363