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23x0.1+2.3x9.9怎么样简便计算

2.1×9.9+0.21简便计算如下: 2.1×9.9+0.21 =2.1x9.9+0.21x1 =2.1x9.9+2.1x0.1 =2.1x(9.9+0.1) =2.1x10 =21

3.9+0.1-3.9+0.1 =(3.9-3.9)+(0.1+0.1) =0+0.2 =0.2

2.6x9.9+0.1简便运算 =2.6x(10-0.1)+0.1 =2.6x10-2.6x0.1+0.1 =26-0.26+0.1 =26.16

3.5×(1.9+2.9)÷0.3 =3.5×{[(2-0.1)+(3-0.1)]÷0.3} =(3+0.5)×{[(2+3)-(0.1+0.1)]÷0.3} =(3+0.5)×[(5-0.2)÷0.3] =(3+0.5)×(4.8÷0.3) =(3+0.5)×16 =3×16+0.5×16 =48+8 =56

5/9

0.3××1.2+9×=22.5 解:0.36×+9×=22.5 9.36x=22.5 x=22.5÷9.36 x≈2.4

(1)101001-45×623,=101001-28035,=72966;(2)7.63×9.9+0.763,=7.63×9.9+7.63×0.1,=7.63×(9.9+0.1),=7.63×10,=76.3;(3)( 2 3 - 1 2 )÷( 3 4 + 1 3 ),= 1 6 ÷ 13 12 ,= 2 13 ;(4) 8 9 ×[ 3 4 -( 7 16 - 1 4 )],= 8 9 ...

原式 =29x0.1+6.7x2.9+2.9x2.3 =2.9x1+6.7x2.9+2.9x2.3 =2.9x(1+6.7+2.3) =2.9x10 =29 供参考。

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