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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

先乘.05得99,再加上乘0.01可得为100.98

200×0.51-2×0.51

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

198*0.5+198*0.01

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

5.1×0.51-0.51 =(5.1-1)×0.51 =4.1×0.51 =4.1×0.5+4.1×0.01 =2.05+0.041 =2.091

简便方法计算 0.96×0.51-0.97×0.5 =0.96×0.51-0.96×0.5-0.01×0.5 =0.96×(0.51-0.5)-0.005 =0.96×0.01-0.005 =0.0096-0.005 =0.0046

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