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1.9x9.9+0.19的简便运算

1.9×9.9+0.19 =1.9×9.9+1.9×0.1 =1.9×(9.9+0.1) =1.9×10 =19

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=0.19乘以99+0.19=0.19乘以(99+1)=19

1.9乘9.9加1.9乘0.1

=1.9*9.9+1.9*0.1 =1.9*(9.9+0.1) =1.9*10 =19

=1.9*.9.9+1.9*0.1 =1.9*(9.9+0.1) =19

解: 原式 =0.92x1.9+0.92x0.1 =0.92x(1.9+0.1) =0.92x2 =1.84

十九分之二加二十一分之一括号乘十九乘二十一用简便计算(2/19+1/21)*(19*21)=2/19*19*21+1/21*19*21=42+19=61

19—9.09+1.91 =19+1-9+0.91-0.09 =11+0.82 =11.82 朋友,请采纳正确答案,你们只提问,不采纳正确答案,回答都没有劲!!! 朋友,请【采纳答案】,您的采纳是我答题的动力,如果没有明白,请追问。谢谢。

原式 =9.9+19.9+119.9+0.3 =10-0.1+20-0.1+120-0.1+0.3 =10+20+120 =30+120 =150

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