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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

=198*0.5+198*0.01 =99+1.98 =100.98

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

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

原式=200-200×0.51 =200(1-0.51) =200×0.49 =2×100×0.49 =2×49 =98

51×19+57简便计算 =51×19+51+6 =51×(19+1)+6 =51×20+6 =1020+6 =1026

201*0.51 =(200+1)*(0.5+1) =100+200+0.5+1 =301.5

5.1×9.9+0.51 =5.1×9.9+5.1×0.1 =5.1×(9.9+0.1) =5.1×10 =51

0.52乘101-0.51的简便计划算 0.52*101-0.51 =0.51*101+101-0.51 =0.51*100+101 =51+101 =152

5.1×7.3+0.27×51 =5.1×7.3+2.7×5.1 =5.1×(7.3+2.7) =5.1×10 =51

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