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100加99减98减97加96加95减94减93.加8加7减6减5加4...

100加99减98减97加96加95减94减93加……加8加7减6减5加4加3减2减1 =(100-98)+(99-97)+...+(4-2)+(3-1) =2x50 =100

100+99-98-97+96+95+...+8+7-6-5+4+3-2-1 =(100-98)+(99-97)+...+(8-6)+(7-5)+(4-2)+(3-1) =2+2+...+2+2+2+2 =2×50 =100

100-99+1乘以「(100-2)\2」=50

99-98+97-96+...+3-2 +1 =(99-98)+(97-96)+...+(3-2) +1 =1+1+...+1 =50

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100加99加98减97减96减95加……加10加9加8减7减6减5 =(100-97)+(99-96)+(98-95)+……+(10-7)+(9-6)+(8-5) =3+3+3+……+3+3+3 共48个 =3x48 =144 行家正解,不明白可以追问!祝您学习进步 满意请点击下面的【选为满意回答】按钮,O(∩_∩)O谢谢

99×98-98×97+96×95-95×94+……+6×5-5×4+3×2-2×1 =98×(99-97)+95×(96-94)+……+5×(6-4)+2(3-1) =98×2+95×2+……+5×2+2×2 =2×(98+95+92+……+8+5+2) =2×(2+98)×33/2 =100×33=3300

1+2+3+4+5...+95+96+97+98+99 =(1+99)x99÷2 =100x99÷2 =50x99 =4950

99-97+95-93+91-89+.+7-5+3-1 =(99-97)+(95-93)+...+(7-5)+(3-1) =2+...+2 =2*25 =50

每4位都用加号相连,有12组,12*(1+100-2-99-3-98+4+97)-49-50+51+52=4

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