Question

17.3乘10.1乘1.73简便算法分析

• 你的回答被采纳后将获得：
• 系统奖励15（财富值+成长值）+难题奖励30（财富值+成长值）

Answer 1

27*27
=(30-3)*(30-3)
=900-2*3*30+9
=900-180+9
=720+9
729

173*173
=(200-27)*(200-27)
=40000-2*200*27+27*27
=40000-400*27+27*27
=40000-10800+729
=29200+729
=29929

17.3*10.1*1.73
=17.3*(10+0.1)*1.73
=(17.3*10+17.3*0.1)*1.73
=(173+1.73)*1.73
=173*1.73+1.73*1.73
=299.29+2.9929
=299.29+3-0.01+0.0029
=302.29-0.01+0.0029
=302.28+0.0029
=302.2829