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0.98x3.2简便方法计算

0.98x3.2 =(1-0.02)x3.2 =3.2-0.02x3.2 =3.2-0.064 =3.136

1,25组 100*50=5000 2,2+100+4+98+……+50+52 =102*50 =5100

10.2x9.7 =(10+0.2)x9.7 =10x9.7+0.2x9.7 =97+1.94 =98.94

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