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4.7×9.9脱式计算

4.7×9.9 =4.7×(10-0.1) =4.7×10-4.7×0.1 =47-0.47 =46.53

=9*5=45

86×9+15×9-9 =9×(86+15-1) =9×100 =900

47.8×9.9 =47.8x(10-0.1) =47.8x10-47.8x0.1 =478-4.78 =478-(5-0.22) =478-5+0.22 =473.22

9.9*9.9 =(10-0.1)*9.9 =10*9.9-0.1*9.9 =99-0.99 =98.01

37*9.9 =111*3.3 =(100+10+1)*3.3 =330+33+3.3 =366.3

2.4×9.9 =2.4×(10-0.1) =2.4×10-2.4×0.1 =24-0.24 =23.76

109×9 =(100+9)X9 =100X9+9X9 =900+81 =981

(100-1)x9 =900-9 =891

3.4×9.9的脱式计算,能简便就多简便 3.4*9.9 =3.4*(10-0.1) =3.4*10-3.4*0.1 =34-0.34 =33.66

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