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1.9x9.9+0.19的简便运算

1.9x9.9+0.9=0.10x99+0.19=0.19x(99+11)=19

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

1.9x0.9 +0.19 解:简便计算 =1.9x0.9 +1.9x0.1 =1.9x(0.9+0.1) 乘法分配律 =1.9x1 =1.9 祝学习进步。

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

1.9x9.9+0.19 =1.9x9.9+1.9×0.1 =1.9×(9.9+0.1) =1.9×10 =19

无法解答

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

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