9999乘以9998的简算kuai diabn

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9999乘以9998的简算kuai diabn
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9999乘以9998的简算kuai diabn
9999乘以9998的简算
kuai diabn

9999乘以9998的简算kuai diabn
9999*9998=(10000-1)*9998
=99980000-9998
=99980000-(10000-2)
=99980000-10000+2
=99970000+2
=99970002

用10000-1乘10000-2

9999乘以9998=(10000-1)(10000-2)=100000000-3*10000+2

9999*9998=(10000-1)*9998
=99980000-9998
=99970002

9999乘以9998
=(10000-1)*9998
=99980000-9998
=99970002

9999*9998
=(10000-1)(10000-2)
=10000*10000-2*10000-1*(100000-2)
=100000000-2*10000-10000+2
=99970000+2
=99970002