10.3×9.7(简便算法)时间、速度!快!拜托啦~~~~~~~~~~~

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10.3×9.7(简便算法)时间、速度!快!拜托啦~~~~~~~~~~~

10.3×9.7(简便算法)时间、速度!快!拜托啦~~~~~~~~~~~
10.3×9.7(简便算法)
时间、速度!快!拜托啦~~~~~~~~~~~

10.3×9.7(简便算法)时间、速度!快!拜托啦~~~~~~~~~~~
10.3*9.7
=(10+0.3)(10-0.3)
=10^2-0.3^2
=100-0.09
=99.91

(10+0.3)*(10-0.3)=10^2-0.3^2

10.3×9.7
=(10+0.3)×(10-0.3)
=10×10-0.3×0.3
=100-0.09
=99.91

(10+0.3)*(10-0.3)=10*10-10*0.3+0.3*10-0.3*0.3=99.91