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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

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

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

=3*9.5=28.5

4.9+4.8+48x0.51 =4.8+0.1+4.8+4.8×5.1 =4.8(1+1+5.1)+0.1 =4.8×7.1+0.1 =34.18

题目不完整 

无法回答

5.1×49+0.51×510 =5.1×49+5.1×51 =5.1×(49+51) =5.1×100 =510

=1.8

因题干条件不完整,缺少文字,不能正常作答。

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