数学,奥数
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数学,奥数
数学,奥数
数学,奥数
7.816×1.45+3.14×2.184+1.69×7.186
=7.186×(1.45+1.69)+3.14×2.184
=3.14×(7.186+2.184)
=3.14×10
=31.4
51又2/3×3/5+71又3/4×4/7+91又4/5×5/9
=(50+5/3)×3/5+(70+7/4)×4/7+(90+9/5)×5/9
=30+1+40+1+50+1
=123
97又1/50×1/49+77又1/40×1/39+57又1/30×1/29
=(98-49/50)×1/49+(78-39/40)×1/39+(58-29/30)×1/29
=2-1/50+2-1/40+2-1/30
=6-(1/50+1/40+1/30)
=5又553/600
9又4/5+99又4/5+999又4/5+9999又4/5
=(10-1/5)+(100-1/5)+(1000-1/5)+(10000-1/5)
=11111-4/5
=11110又1/5
0
这奥数是奥在计算量上?31.4,123,3553/600,2109.2所有,过程7.816*(1.45+1.69)+3.14*2.184=3.14*(7.816+2.184)=31.4
(51*3+2)/5=(50*3+5)/5=31
(71*4+3)/7=(70*4+7)/7=41
(91*5+4)/9=(90*5+9)/9=51 加起来123
(97*50+1...
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这奥数是奥在计算量上?31.4,123,3553/600,2109.2
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