9999+9998+9997+9996简算

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9999+9998+9997+9996简算
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9999+9998+9997+9996简算
9999+9998+9997+9996简算

9999+9998+9997+9996简算
10000-1+10000-2+10000-3+10000-4
=40000-10
=39990

9999+9998+9997+9996
=10000-1+10000-2+10000-3+10000-4
=40000-(1+2+3+4)
=40000-10
=39990

(10000-1)+(10000-2)+(10000-3)+(10000-4)
=4*10000-1-2-3-4
=40000-10
=39990

原式=4x10000-1-2-3-4=39990

10000-1+10000-2+10000-3+10000-4=40000-10=39990