下面各题怎样简便就怎样算.101×99 25×32×25 (125+50)×8 11.91+8.59+20.09 44.5×4+55.5×
下面各题怎样简便就怎样算.101×9925×32×25(125+50)×811.91+8.59+20.0944.5×4+55.5×44.64-2.36-1.64-0.24...
下面各题怎样简便就怎样算.101×99 25×32×25 (125+50)×8 11.91+8.59+20.09 44.5×4+55.5×4 4.64-2.36-1.64-0.24.
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(1)101×99 =(100+1)×99 =100×99+1×99 =9900+99 =9999; (2)25×32×25 =25×4×8×25 =(25×4)×(8×25) =100×200 =20000; (3)(125+50)×8 =125×8+50×8 =1000+400 =1400; (4)11.91+8.59+20.09 =11.91+20.09+8.59 =32+8.59 =40.59; (5)44.5×4+55.5×4 =(44.5+55.5)×4 =100×4 =400; (6)4.64-2.36-1.64-0.24 =(4.64-1.64)-(2.36+0.24) =3-2.6 =0.4. |
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