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十点1×89%8点九用简便方法计算

原式 =10.1x89-8.9 =10.1x89-89x0.1 =(10.1-0.1)x89 =10x89 =890 供参考。

回答: 86.7*10.1=86.7*10+86.7*0.1 =867+8.67 =875.67

16.8×10.1 =16.8×(10+0.1) =16.8×10+16.8×0.1 =168+1.68 =169.68

(10+0.1)×4.38=44.238

原式 =3.84x9.6+0.96x61.6 =3.84x9.6+0.96x10x6.16 =3.84x9.6+9.6x6.16 =(3.84+6.16)x9.6 =10x9.6 =96

99×10.1=99×(10+0.1)=99×10+99×0.1=990+9.9=999.9

是20.09吗?如果是20.09*37-200.9*1.9-2009*0.82=2009*0.37-2009*0.19-2009*0.82=2009x(0.37-0.19-0.82)=2009x(-0.64)=-1285.76

原式 =43x11.8+86x9.1 =43x11.8+43x2x9.1 =43x11.8+43x18.2 =43x(11.8+18.2) =43x30 =1290

50.4*1.9-1.8 =50.4*1.9-1.9+0.1 =1.9(50.4-1)+0.1 =49.4(2-0.1)+0.1 =98.8-4.94+0.1 =98.8-4.84 =93.96

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