计算:(1) 1+(-2)+3+(-4)+…+99+(-100) (2)计算:(1) 1+(-2)+3+(-4)+…+99+(-100) (2) 5/31×(-2/9)×(-1/30)×(-1/8) (3) 18/171×(-5) (4) 5×(-1/21)+(+17)×(-1/21)-12×(-1/21)
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![计算:(1) 1+(-2)+3+(-4)+…+99+(-100) (2)计算:(1) 1+(-2)+3+(-4)+…+99+(-100) (2) 5/31×(-2/9)×(-1/30)×(-1/8) (3) 18/171×(-5) (4) 5×(-1/21)+(+17)×(-1/21)-12×(-1/21)](/uploads/image/z/66303-63-3.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A%281%29+1%2B%28-2%29%2B3%2B%28-4%29%2B%E2%80%A6%2B99%2B%28-100%29+%282%29%E8%AE%A1%E7%AE%97%EF%BC%9A%281%29+1%2B%28-2%29%2B3%2B%28-4%29%2B%E2%80%A6%2B99%2B%28-100%29+%282%29+5%2F31%C3%97%28-2%2F9%29%C3%97%28-1%2F30%29%C3%97%28-1%2F8%29+%283%29+18%2F171%C3%97%28-5%29+%284%29+5%C3%97%28-1%2F21%29%2B%28%2B17%29%C3%97%28-1%2F21%29-12%C3%97%28-1%2F21%29)
计算:(1) 1+(-2)+3+(-4)+…+99+(-100) (2)计算:(1) 1+(-2)+3+(-4)+…+99+(-100) (2) 5/31×(-2/9)×(-1/30)×(-1/8) (3) 18/171×(-5) (4) 5×(-1/21)+(+17)×(-1/21)-12×(-1/21)
计算:(1) 1+(-2)+3+(-4)+…+99+(-100) (2)
计算:(1) 1+(-2)+3+(-4)+…+99+(-100) (2) 5/31×(-2/9)×(-1/30)×(-1/8) (3) 18/171×(-5) (4) 5×(-1/21)+(+17)×(-1/21)-12×(-1/21)
计算:(1) 1+(-2)+3+(-4)+…+99+(-100) (2)计算:(1) 1+(-2)+3+(-4)+…+99+(-100) (2) 5/31×(-2/9)×(-1/30)×(-1/8) (3) 18/171×(-5) (4) 5×(-1/21)+(+17)×(-1/21)-12×(-1/21)
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-50
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(1)-50;(2)-1/3906;(3)-90/171;(4)-10/21
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