Question

19×91+89+82简便方法？

Answer 1

19×91+89+82简便方法?
=（20-1）x（90+1）+（90-1）+（90-8）
=1800+20-90-1+90-1+90-8
=1800+110-10
=1900

Answer 2

19×91+89+82
=19×91+89+2+80
=19×91+91+80
=（19+1）×91+80
=20×91+20×4
=20×（91+4）
=20×95
=1900

Answer 3

19*91+89+82
=91*（19+1）+80
=91*20+80
=1820+80
=1900

Answer 4

原式=19x（100-9）+89+82
=19x100-19x9+89+82
=1900-19x（10-1）+171
=1900-19x10+19+171
=1900-190+190
=1900-0
=1900

Answer 5

原式=19*91+91+80
=20*91+80
=1820+80
=1900