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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

9.9×4.6=(10-0.1)×4.6=10×4.6-0.1×4.6=46-0.46=45.54

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

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

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

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

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

3.6×9.9 =3.6×(10-0.1) =3.6×10-3.6×0.1 =36-0.36 =35.64

8.7×9.9 =8.7x(10-0.1) =87-0.87 =86.13

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