计算题,超难的.1、(2 又2/9*4/5+2又2/9+6.2-5.8*2又2/9-1/5*2又2/9)*9/202、1/2+5/6+11/12+19/20+29/30+……+9701/9702+9899/9900
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![计算题,超难的.1、(2 又2/9*4/5+2又2/9+6.2-5.8*2又2/9-1/5*2又2/9)*9/202、1/2+5/6+11/12+19/20+29/30+……+9701/9702+9899/9900](/uploads/image/z/12610208-56-8.jpg?t=%E8%AE%A1%E7%AE%97%E9%A2%98%2C%E8%B6%85%E9%9A%BE%E7%9A%84.1%E3%80%81%EF%BC%882+%E5%8F%882%2F9%2A4%2F5%2B2%E5%8F%882%2F9%2B6.2-5.8%2A2%E5%8F%882%2F9-1%2F5%2A2%E5%8F%882%2F9%EF%BC%89%2A9%2F202%E3%80%811%2F2%2B5%2F6%2B11%2F12%2B19%2F20%2B29%2F30%2B%E2%80%A6%E2%80%A6%2B9701%2F9702%2B9899%2F9900)
计算题,超难的.1、(2 又2/9*4/5+2又2/9+6.2-5.8*2又2/9-1/5*2又2/9)*9/202、1/2+5/6+11/12+19/20+29/30+……+9701/9702+9899/9900
计算题,超难的.
1、(2 又2/9*4/5+2又2/9+6.2-5.8*2又2/9-1/5*2又2/9)*9/20
2、1/2+5/6+11/12+19/20+29/30+……+9701/9702+9899/9900
计算题,超难的.1、(2 又2/9*4/5+2又2/9+6.2-5.8*2又2/9-1/5*2又2/9)*9/202、1/2+5/6+11/12+19/20+29/30+……+9701/9702+9899/9900
1.(2又2/9*4/5+2又2/9+6.2-5.8*2又2/9-1/5*2又2/9)*9/20
=[2又2/9*(1+4/5)-2又2/9*(5.8+1/5)+6.2]*9/20
=[20/9)*(9/5)-(20/9)*6+6.2]*9/20
=1.8-6+124
=119.8
2、1/2+5/6+11/12+19/20+29/30+……+9701/9702+9899/9900
=1-1/2+1-1/6+...+1-1/9900
=1*99-(1-1/2+1/2-1/3+...+1/99-1/100)
=99-(1-1/100)
=99-1+1/100
=9801/100
=(1-1/2)+(1-1/6)+......+(1-1/9900)
=99-(1/2+1/6+....+1/9900)
=99-(1/1×2+1/2×3+1/3×4+.....+1/99×100)
=99-(1-1/2+1/2-1/3+1/3-...+1/99-1/100)
=99-99/100
=98+1/100...
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=(1-1/2)+(1-1/6)+......+(1-1/9900)
=99-(1/2+1/6+....+1/9900)
=99-(1/1×2+1/2×3+1/3×4+.....+1/99×100)
=99-(1-1/2+1/2-1/3+1/3-...+1/99-1/100)
=99-99/100
=98+1/100
收起
挺复杂,你不给高分谁愿意浪费时间啊。哈哈