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9x99+9简便

9×99+9 =9×99+9×1 =9×(99+1) =9×100 =900

就这样

9x99+9 =9x(99+1) =9×100 =900

=60.9X(99+1) =60.9X100 =6090

9×99+9=9×(99+1)=9×100=900

9.78x99+9.78 =9.78×(99+1)【这是关键的一步】 =9.78×100 =978

参考

答案如下

9.62×99+9.62 =9.62×99+9.62×1 =9.62×(99+1) =9.62×100 =962

解:原式=9.12×(99+1) =9.12×100 =912 祝你学习进步! 望采纳

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