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199.199乘以198减198.198乘199=?用简便方法计算.怎...

199.199*198-198.198*199 =(199+0.199)*198-(198+0.198)*199 =199*198+0.199*198-198*199-0.198*199 =0.199*198-0.198*199 =0

199.99*198-198.198*199=199.99*198-1.001*198*199 =199.99*198-199.199*198 =0.71*198 =140.58

199.99*198-198.198*199=199.99*198-1.001*198*199 =199.99*198-199.199*198 =0.71*198 =140.58希望采纳

199.199*198-198.198*199=198*199*(1.001-1.001)=0是这样吗

解:原式=199.199*199-199.199-198.198*199=199*(199.199-198.198)-199.199=199*1.001-199.199=199*1.001-199*1.001=0

(1)199.199*198-198.198*199 =199.199*(199-1)-198.198*199 =199(199.199-198.198)-199.199=199.199-199.199=0(2)18.9*178.178-178.*189.189+0.49=189*178(0.1*1.001-1.001)+0.49=189*178(-0.9009)+0.49=-30307.587

两边都先乘以1000,得: 199199*198 - 198198*199 然后这样算: =199199*198 - 198198*198 - 198198*1 =198*(199199 -198198)-198198 =198*1001 -198198 =198198 -198198 =0 完毕

199.199*198-198.198*199 =199*(1+0.001)*198-198*(1+0.001)*199 =199*1.001*198-198*1.001*199 =(199*1.001-1.001*199)*198 =0*198 =0

199.199*198-198.198*199=(199+0.199)*198-(198+0.198)*199=199*198+0.199*0.198-198*199-0.198*0.198=018.9*178.178 +0.49-17.8*189.189 =18.9*(178+0.178) +0.49-17.8*(189+0.189)=18.9*178+18.9*0.178+0.49-17.8*189-17.8*0.189 =0.49呵呵,就是这样子,答案没问题的话要采纳哦~谢谢

(1)199.199*198-198.198*199 =199.199*(199-1)-198.198*199 =199(199.199-198.198)-199.199=199.199-199.199=0(2)18.9*178.178-178.*189.189+0.49=189*178(0.1*1.001-1.001)+0.49=189*178(-0.9009)+0.49=-30307.587

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