几道小六简便运算题,请一步一步地算,1.9又9656/657*4532.0.75*14又1/9+3/4*1又8/9-12*75%3.43*136/137+136*59/137+70*68/1374.2009*20102010-2010*200920095.13/16*(9/13*17-9/13)

问题描述:

几道小六简便运算题,请一步一步地算,
1.9又9656/657*453
2.0.75*14又1/9+3/4*1又8/9-12*75%
3.43*136/137+136*59/137+70*68/137
4.2009*20102010-2010*20092009
5.13/16*(9/13*17-9/13)

2009x20102010-2010x20092009=2009x20102010-(2009+1)x20092009=2009(20102010-20092009)-20092009=2009x10001-20092009=0136/137(43+59)+70x68/137=102x68x2/137+70x68/137=68/137(204+70)=68x274/137=68x2...