几道小六简便运算题,请一步一步地算,

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