求2道计算题,一:9+99+999+9999 二:998+997+996+1002+1003+1004 = = = =
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![求2道计算题,一:9+99+999+9999 二:998+997+996+1002+1003+1004 = = = =](/uploads/image/z/250767-63-7.jpg?t=%E6%B1%822%E9%81%93%E8%AE%A1%E7%AE%97%E9%A2%98%2C%E4%B8%80%EF%BC%9A9%2B99%2B999%2B9999+%E4%BA%8C%EF%BC%9A998%2B997%2B996%2B1002%2B1003%2B1004+%3D+%3D+%3D+%3D)
求2道计算题,一:9+99+999+9999 二:998+997+996+1002+1003+1004 = = = =
求2道计算题,一:9+99+999+9999 二:998+997+996+1002+1003+1004 = = = =
求2道计算题,一:9+99+999+9999 二:998+997+996+1002+1003+1004 = = = =
9+99+999+9999
=1+9+1+99+1+999+1+9999-4
=11110-4
=11106
二:
998+997+996+1002+1003+1004
=(998+1002)+(997+1003)+(996+1004)
=2000+2000+2000
=6000
(1)9+99+999+9999
=10-1+100-1+1000-1+10000-1
=11110-4
=11106
(2)998+997+996+1002+1003+1004
=(998+1002)+(997+1003)+(996+1004)
=2000+2000+2000
=6000
1、原式=10-1+100-1+1000-1+10000-1=11110-4=11106
2、原式=998+1002+997+1003+996+1004=2000+2000+2000=6000
一:9+99+999+9999
=6+100+1000+10000
=11106
二:998+997+996+1002+1003+1004
=998+1002+997+1003+996+1004
=2000+2000+2000
=6000
9+99+999+9999
=100+1000+10000+6
=11106
998+997+996+1002+1003+1004
=(998+1002)+(997+1003)+(996+1004)
=2000+2000+2000
=6000
9+99+999+9999
=10-1+100-1+1000-1+1000-1
=11110-4
=11106
二:
998+997+996+1002+1003+1004
=1000-2+1000-3+1000-4+1000+2+1000+3+1000+4
=6000