19999+2999+399+49计算

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19999+2999+399+49计算19999+2999+399+49计算19999+2999+399+49计算19999+2999+399+49=20000-1+3000-1+400-1+50-1

19999+2999+399+49计算
19999+2999+399+49计算

19999+2999+399+49计算
19999+2999+399+49
=20000-1+3000-1+400-1+50-1
=23450-4
=23446

19999 + 2999 + 399 + 49
= 20000 - 1 + 3000 - 1 + 400 - 1 + 50 - 1
= (20000 + 3000 + 400 + 50) - 4
= 23450 - 4
= 23446

19999+2999+399+49
=(20000-1)+(3000-1)+(400-1)+(50-1)
=20000+3000+400+50-4
=23450-4
=23446

19999+2999+399+49
=(20000-1)+(3000-1)+(400-1)+(50-1)
=20000+3000+400+50-4
=23450-4
=23446

23446

19999+2999+399+49
=20000-1+3000-1+400-1+50-1
=23450-4
=23446

19999等于20000减1.2999等于3000减1.原式可写成(20000-1)+(3000-1)+(400-1)+(50-1)=23446

19999+2999+399+49
原式=20000+3000+400+50-4
=23450-4
=23446