1991+199.1+19.91+1.991
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1991+199.1+19.91+1.9911991+199.1+19.91+1.9911991+199.1+19.91+1.9911991+199.1+19.91+1.991=1991×(1+0.1
1991+199.1+19.91+1.991
1991+199.1+19.91+1.991
1991+199.1+19.91+1.991
1991+199.1+19.91+1.991
=1991×(1+0.1+0.01+0.001)
=1991×1.111
=(2000-9)×1.111
=2000×1.111-9×1.111
=2222-9.999
=2222-10+0.001
=2212+0.001
=2212.001
或
1991+199.1+19.91+1.991
=(2000-9)+(200-0.9)+(20-0.09)+(2-0.009)
=2222-9.999
=2222-(10-0.001)
=2222-10+0.001
=2212.001
(2000-9)*1.111=2222-9.999=2222-10+0.001=2212+0.001=2212.001
或
1.991*1000+1.991*100+1.991*10+1.991*1
=1.991*(1000+100+10+1)
=1.991*1111
=2212.001
(2000-9)+(200-0.9)+(20-0.09)+(2-0.009)=2222-9.999=2212.001
1991+199.1+19.91+1.991
1991+199.1+19.91+1.991
求 算术 1991+199.1+19.91+1.991=?求 算术 1991+199.1+19.91+1.991=?要一些过程,不要结果,要结果计算机
1991+199.1+19.91+1.991=?(简便方法)
简算题1991+199.1+19.91+1.991=
巧算题求解1991+199.1+19.91+1.991
1991+199.1+19.91+1.991+0.1991 怎么简便运算
用简便方法计算:1991+199.1+19.91+1.991
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