简便计算

1)169×121÷13÷11
=(13*13)*(11*11)÷13÷11
=13*11
=143
(2)(789+789)×50=
=789*2*50
=789*100
=78900
(3)12800÷(128÷4)
=12800 ÷128*4
=100*4
=400
(4)675×675-674×676=
=(674+1)x675-674x676
=674x675+675-674x676
=674*(675-676)+675
=-674+675
=1
(5)101×99×999+999=
=(101x99+1)x999
=((100+1)x99+1)x999
=(9900+99+1)x999
=(9900+100)x999
=10000x999
=9990000
(6)11×12×13-12×13-260=
=11x12x13-12x13-13x20
=13x(11x12-12-20)
=13x(12x(11-1)-20)
=13x(12x10-20)
=13x(120-20)
=13x100
=1300

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