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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

1.9×0.99+0.19 解:原式=1.9x0.99+1.9x0.1 =1.9x(0.99+0.1) =1.9x1.09 =2.071 答:答案是2.071。

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

解:原式=1.9×(10-0.1)×0.19 =(1.9×10-1.9×0.1)×0.19 =(19-0.19)×0.19 =19×0.19-0.19×0.19 =3.61-0.0361 =3.5739

1.9x9.9十0.19 =0.19x99十0.19 =0.19x(99+1) =0.19x100 =19

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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