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10.1×99.9简便计算

99.9×10.1+99.9×99 =99.9×(10+0.1)+99.9×(100-1) =999+9.99+9990-99.9 =1000-1+10-0.01+10000-10-100+0.1 =10000+(1000-100)-1+(0.1-0.01) =10899+0.09 =10899.09

原式=99.9*109.1 =[(99.9+0.1)-0.1]*109.1 =(100-0.1)*109.1 通过加减0.1 使99.9凑出100,化简计算。

原式等于 (10+0.1)(100-0.1)=1008.99 ~回答完毕~ ~\(^o^)/~祝学习进步~~~

10.1x9.9 =(10+0.1)x(10-0.1) =10²-0.1² =100-0.01 =99.99

99.9×10.1 =(100-0.1)×(10+0.1) =100×10-10×0.1+0.1×100-0.1×0.1 =1000-1+10-0.01 =1008.99

=99X(10+0.1)-9.9 =990+9.9-9.9 =990

=1-1/10+1-1/100+1-1/1000+1-1/10000+1-1/100000 =5-1/10-1/100-1/1000-1/10000-1/100000 =5-(0.1+0.01+0.001+0.0001+0.00001) =5-0.11111 =4.88889

解:99.9×10.1+99.9x99 =99.9x(10.1+99) =(100-0.1)x109.1 =10910-10.91 =10899.09

10.1*99-9.9 解:简便方法 =101x9.9-1x9.9 运用乘法分配率 =(101-1)x9.9 =100x9.9 =990 祝学习进步。

9.9*10.1-99*0.01 =9.9×10.1-9.9×0.1 =9.9×(10.1-0.1) =9.9×10 =99

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