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1.9x9.9+0.19用简便的脱式计算

=1.9x1–1.9x0.9 =1.9x(1-0.9) =1.9x0.1 =0.19

9.9×0.81 =(10-0.1)×0.81 =10×0.81-0.081 =8.1-0.081 =8.019

8.9×0.1+0.1×1 =0.1×(8.9+0.1) =0.1×9 =0.9

7.8×9.9脱式计算(能简便的就简便) 7.8×9.9 =7.8*(10-0.1) =7.8*10-7.8*0.1 =78-0.78 =77.22

说对方是范德萨

1.9×4点5+0点45 =1.9x4.5+4.5x0.1 =4.5x(1.9+0.1) =4.5x2 =9

1.9+19点9+199点9+0点3 =2-0.1+20-0.1+200-0.1+0.3 =(2+20+200)-(0.1+0.1+0.1)+0.3 =222-0.3+0.3 =222

19.7x9.9+19.7用脱式计算 =19.7x(10-0.1)+19.7 =19.7x10-19.7x0.1+19.7 =197-1.97+19.7 =195.03+19.7 =214.73

=9.9x9.9+9.9x0.1 =9.9x(9.9×0.1) =9.9x10 =99

(3.64一5.696/8.9x1.2)x0.05 =(3.64-0.64x1.2)x0.05 =(3.64-0.768)x0.05 =2.872x0.05 =0.1436 (请采纳)

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