简便计算:101×47 125×25×8 99×37 428+257-(157+38) 101×101-101

简便计算:101×47 125×25×8 99×37 428+257-(157+38) 101×101-101.

(1)101×47,
=100×47+1×47,
=4700+47,
=4747;

(2)125×25×8,
=(125×8)×25,
=1000×25,
=25000;

(3)99×37,
=(100-1)×37,
=100-37-1×37,
=3700-37,
=3663;

(4)428+257-(157+38),
=428+(257-157-38),
=428+62,
=490;

(5)101×101-101,
=101×(101-1),
=101×100,
=10100.
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