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)
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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)
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)
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)
2009x20102010-2010x20092009
=2009x20102010-(2009+1)x20092009
=2009(20102010-20092009)-20092009
=2009x10001-20092009
=0
136/137(43+59)+70x68/137
=102x68x2/137+70x68/137
=68/137(204+70)
=68x274/137
=68x2=136
3/4×(14+1/9)+3/4×(1+8/9)-12x3/4
=3/4×(14+1+1)-9
=3/4×16-9
=12-9=3
13/16*(9/13*17-9/13)
=13/16*9/13(17-1)
=13/16*16*9/13
=13x9/13
=9
1
原式=(9+656/657)x151x3
=(10-1/657)x151x3
=4530-151/219
=4529+68/219
=4529又68/219