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198×0.51的简便计算

198×0.51 =(200-2)x0.51 =200x0.51-2x0.51 =102-1.02 =100.98 谢谢,请采纳

198x0.51 =(200-2)x0.51 =200x0.51-2x0.51 =你自己算吧,不动脑子不行的

200×0.51-2×0.51

98*0.51 =(100-2)*0.51 =51-1.02 =49.98

先乘.05得99,再加上乘0.01可得为100.98

0.51x198 =0.51x(200-2) =0.51x200-0.51x2 =102-1.02 =100.98

解:51×0.51━0.5 =51×(0.5+0.01)-0.5 =51×0.5+51×0.01-1×0.5 =(51-1)×0.5+0.51 =50×0.5+0.51 =25+0.51 =25.51

解:51×0.51━0.5 =51×(0.5+0.01)-0.5 =51×0.5+51×0.01-1×0.5 =(51-1)×0.5+51×0.01 =50×0.5+0.51 =25+0.51 =25.51

5.5×4.9+55×0.51 =5.5x4.9+5.5x5.1 =5.5x(4.9+5.1) =5.5x10 =55 行家正解,不明白可以追问!祝您学习进步 满意请点击下面的【选为满意回答】按钮,O(∩_∩)O谢谢

(0.5*2.2)+(0.01*2.2)=1.1+0.022=1.122

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