19999+1999+199+99+4简算

问题描述:

19999+1999+199+99+4简算

19999+1+1999+1+199+1+99+1=20000+2000+200+100=22300

99+199+1999+19999+4
=99+199+1999+19999+(1+1+1+1)
=(99+1)+(199+1)+(1999+1)+(19999+1)
=100+200+2000+20000
=22300

99+199+1999+19999+4
=(100-1)+(200-1)+(2000-1)+(20000-1)+(1+1+1+1)
=(100+200)+(2000+20000)+(1-1)+(1-1)+(1-1)+(1-1)
=300+22000+0+0+0+0=22300

19999+1999+199+99+4=19999+1+1999+1+199+1+99+1=20000+2000+200+100=22300