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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。

86.7x10.1 =86.7x(10+0.1) =86.7x10+86.7x0.1 =867+8.67 =875.67

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

16.8x10.1=16.8*(10+0.1)

十六点7×2点1+10点八简便算 16.7*2.1+10.8 =35.07+10.8 =45.87

=13.5×(10+0.1)+6.5×(10-0.1) =135+1.35+65-0.65 =200+0.7 =200.7

9.9×212 =(10-0.1)×212 =10×212-0.1×212 =2120-21.2 =2098.8

【问:10.01、10.02……到10.99相加等于几?】 【10.01、10.02……到10.99共99项,最前第1项与最后第1项、再最前第2项与最后第2项、……,两两结合(相加),99/2=49余1,则可结合49组,剩余1项为(10.01+10.99)/2=10.50,再,……】 解: 10.01+10.02+10....

一千九百九十九加一百九十九加十九点九九加一点九九九的简便运算 =2000-1+200-1+20-0.01+2-0.001 =2200+(20-0.011) =2200+19.989 =2219.989

86.9x10.1 =86.9x(10+0.1) =86.9x10+86.9x0.1 =869+8.69 =877.69

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