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23x0.1+2.3x9.9怎么样简便计算

3.2x9.9 =3.2x10 -3.2x0.1 =32-0.32 =31.68

9.13x0.2十91.3x0.08 =9.13*(0.2+0.8) =9.13

9.9²+9.9X0.2+0.01=9.9²+2X9.9X0.1+0.1²=(9.9+0.1)²=10²=100就是完全平方式的应用,a²+2ab+b²=(a+b)²

0.1+0.2+0.3.........+9.8+9.9 =(0.1+9.9)X99÷2 =10x99÷2 =495

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

请采纳

2.5*4*0.3*9.9=10*9.9*0.3=99*0.3=29.7

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。

3.2×9.9+32 =3.2×(10-0.1)+32 =32-0.32+32 =64-0.32 =63.68

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