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列竖式计算了26x3.45

解:26x3.45=89.7 ..................3.45 ...............X....26 ..........—————— .................2070 ...........+....690 ..........—————— .................89.70

130*35 =130*70/2 =9100/2 =4550 或: 130*35 =(100+30)*35 =3500+1050 =4550

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