2x+2x(99-x)=99
2x(99-x+1)=99
2x(100-x)=99
200x-2 x的平方
2x+2x(99-x)=99
2个回答
相关问题
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1x1+0x1+2x2+1x2+3x3+2x3+4x4+3x4……99x99+98x99+100x100+99x100
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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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X²+2X=99,
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当X=-1时 求X+2X^2+3X^3+…+99^99+100X^100
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100X100-99X99-98X98-97X97+…+2X2-1X1=?
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99x99+99x99怎么简便?
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计算100X100-99X99+98X98-97X97+...+2X2-1X1=
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99的2次方+2X99+1
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[1+1.2]+[2+1.2x2]+[3+1.2x3]+.+[99+1.2x99]+[100+1.2x100]=?