101×168+99×221.99+19.99+199.9+1999两道简算题.记得要简算过程、、、

101×168+99×221.99+19.99+199.9+1999两道简算题.记得要简算过程、、、
101×168+99×22
1.99+19.99+199.9+1999
两道简算题.
记得要简算过程、、、

101×168+99×221.99+19.99+199.9+1999两道简算题.记得要简算过程、、、
101×168+99×22
=(100+1)×168+(100-1)×22
=100×168+100×22+168-22
=100×(168+22)+146
=100×190+146
=19000+146
=19146
1.99+19.99+199.9+1999
=(2-0.01)+(20-0.01)+(200-0.1)+(2000-1)
=2+20+200+2000-1-0.1-0.01-0.01
=2222-1.12
=2220.88