(100+99)x(100-99)+(98+97)x(98-97)+.(2+1)x(2-1) =(100+99)+(98+97)+.(2+1) =100+99+98+97+.2+1 =101x50 =5050
计算100X100-99X99+98X98-97X97+...+2X2-1X1=
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相关问题
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100X100-99X99-98X98-97X97+…+2X2-1X1=?
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3x(1x2+2x3+3x4+……+99x100)= (A)97x98x99 (B)98x99x100 (C)99x 1
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100X100—99X99+98X98+...+2X2—1X1
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100x99+98x97+96x95+94x93.+4x3+2x1
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(X-1)(X99+X98+X97+...+X+1)
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计算100²-99²-+98²-97²+...+2²-1
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计算:100²-99²+98²-97²+…+2²-1
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100-99+98-98+97-97+96……-2+1
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100*100-99*99+98*98-97*97+96*96-95*95+...+2*2-1*1
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简便计算: 53x54+54x16+69x25+21x69 [98+95+100+99+100+96+96+97+99]