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0.9+99×0.9的简便计算

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0.9+99x0.9 =0.9x(99+1) =0.9x100 =90

利用简便计算就可以了,如下计算; 0.9+99X0.9 =0.9X(1+99) 【提取相同部分:0.9】 =0.9X100 =90

原式=0.9×(99+1)=0.9×100=90

0.9+99x0.9 =0.9x(1+99) =0.9x100 =90

解:采用分配律, 1999x0.99x0.9 =(2000-1)x0.99x0.9 =2000x0.99x0.9-0.99x0.9 =1980x(1-0.1)-(1-0.01)x0.9 =1980-1980x0.1-0.9+0.01x0.9 =1980-198-0.9+0.009 =1782-0.891 =1781.109

0.9+9.9+99.9+999.9 =1-0.1+10-0.1+100-0.1+1000-0.1 =1+10+100+1000-0.1-0.1-0.1-0.1 =1111-0.1×4 =1111-0.4 =1110.6

0.9+9.9+99.9+999.9 =1-0.1+10-0.1+100-0.1+1000-0.1 =1+10+100+1000-0.1-0.1-0.1-0.1 =1111-0.4 =1110.6 谢谢,请采纳

0.9+9.9+99.9+999.9+9999.9 =1-0.1+10-0.1+100-0.1+1000-0.1+10000-0.1 =(1+10+100+1000+10000)-0.1×5 =11111-0.5 =11110.5

=1-0.1+10-0.1+100-0.1+1000-0.1 =(1+10+100+1000)-0.1X4 =1111-0.4 =1110.6

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