\(\Leftrightarrow y\cdot\dfrac{99}{50}=\dfrac{198}{100}=\dfrac{99}{50}\)
hay y=1
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\(\Leftrightarrow y\cdot\dfrac{99}{50}=\dfrac{198}{100}=\dfrac{99}{50}\)
hay y=1
tính:2/1x2+2/2x3+2/3x4+2/4x5+...+2/99x100
tinh nhanh 2/1X2+2/2X3 +2/3X4+2/4X5 + ............ +2/99X100
2/1x2+2/2x3+2/3x4+..............+2/98x99+2/99x100
2/1x2+2/2x3+2/3x4+...........................+2/98x99+2/99x100
Tinh 1x2+2x3+3x4+...+99x100
Tinh 1x2+2x3+3x4+...+99x100
1x2 + 2x3 + 3x4 + 4x5 + .... +99x100
Tính nhanh: 1x2+2x3+3x4+...+99x100
A =1x2+2x3+3x4+...+99x100 = ?