999.9*999.9+199.99巧算顺便一起接了!(10.1-1.009-2)*0.49+0.51*(10.1-1.009+1)111.1(2002个)*999...9(2002个)越快越好!
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![999.9*999.9+199.99巧算顺便一起接了!(10.1-1.009-2)*0.49+0.51*(10.1-1.009+1)111.1(2002个)*999...9(2002个)越快越好!](/uploads/image/z/128888-8-8.jpg?t=999.9%2A999.9%2B199.99%E5%B7%A7%E7%AE%97%E9%A1%BA%E4%BE%BF%E4%B8%80%E8%B5%B7%E6%8E%A5%E4%BA%86%21%EF%BC%8810.1-1.009-2%EF%BC%89%2A0.49%2B0.51%2A%EF%BC%8810.1-1.009%2B1%EF%BC%89111.1%282002%E4%B8%AA%EF%BC%89%2A999...9%EF%BC%882002%E4%B8%AA%EF%BC%89%E8%B6%8A%E5%BF%AB%E8%B6%8A%E5%A5%BD%EF%BC%81)
999.9*999.9+199.99巧算顺便一起接了!(10.1-1.009-2)*0.49+0.51*(10.1-1.009+1)111.1(2002个)*999...9(2002个)越快越好!
999.9*999.9+199.99巧算
顺便一起接了!
(10.1-1.009-2)*0.49+0.51*(10.1-1.009+1)
111.1(2002个)*999...9(2002个)
越快越好!
999.9*999.9+199.99巧算顺便一起接了!(10.1-1.009-2)*0.49+0.51*(10.1-1.009+1)111.1(2002个)*999...9(2002个)越快越好!
999.9*999.9+199.99
=(1000-0.1)*999.9+199.99
=999900-99.99+199.99
=999900+100
=1000000
(10.1-1.009-2)*0.49+0.51*(10.1-1.009+1)
=10.1*0.49-1.009*0.49-2*0.49+0.51*10.1-0.51*1.009+0.51*1
=10.1*(0.49+0.51)-1.009*(0.49*0.51)-2*(0.49+0.51)+0.51*3
=10.1-1.009-2+1.51
=10.1-1.009-0.49
=10.1-1.499
=10.1-1.5+0.001
=8.6+0.001
=8.601
111.1(2002个)*999...9(2002个)
=111.1(2002个)*1000000(2002个0)-111.1(2002个)*1
=111.1(2002个1)00000...00(2002个)-111.1(2002个)
=111...1(2001个1)888888(2001个8)9
第一题:(1000-0.1)*(1000-0.1)+200-0.01=1000000;
下面的也类似的做
999.9*999.9+199.99
=(1000-0.1)*999.9+199.99
=999900-99.99+199.99
=999900+100
=1000000