=(189+11)+(65+25) =200+ 90 =290
=(100-1)×16 =100×16-1×16 =1600-16 =1584
=(25×4)×(125×8) =100×1000 =100000
=25×44×5 =(25×4)×(11×5) =100×55 =5500
=4002-(232+1021+247) =4002-1500 =2502
=(126+274)+(165+145) =400+310 =710
=19×25+25×81 =(19+81)×25 =100×25 =2500
=4×25×(36+64) =4×25×100 =100×100 =10000
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