观察下列各式:1X2=1/3(1x2x3-0x1x2) 2x3=1/3(2x3x4-1x2x3) 3x4=1/3(3x4x5-2x3x4) ```计算:3x(1x2+2x3+3x4+```+99x100)= ( )A.97x98x99 B.98x99x100 C.99x100x101 D.100x101x102
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![观察下列各式:1X2=1/3(1x2x3-0x1x2) 2x3=1/3(2x3x4-1x2x3) 3x4=1/3(3x4x5-2x3x4) ```计算:3x(1x2+2x3+3x4+```+99x100)= ( )A.97x98x99 B.98x99x100 C.99x100x101 D.100x101x102](/uploads/image/z/614899-19-9.jpg?t=%E8%A7%82%E5%AF%9F%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%EF%BC%9A1X2%3D1%2F3%281x2x3-0x1x2%29+2x3%3D1%2F3%282x3x4-1x2x3%29+3x4%3D1%2F3%283x4x5-2x3x4%29+%60%60%60%E8%AE%A1%E7%AE%97%EF%BC%9A3x%281x2%2B2x3%2B3x4%2B%60%60%60%2B99x100%29%3D+%28+%29A.97x98x99+B.98x99x100+C.99x100x101+D.100x101x102)
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观察下列各式:1X2=1/3(1x2x3-0x1x2) 2x3=1/3(2x3x4-1x2x3) 3x4=1/3(3x4x5-2x3x4) ```计算:3x(1x2+2x3+3x4+```+99x100)= ( )A.97x98x99 B.98x99x100 C.99x100x101 D.100x101x102
观察下列各式:1X2=1/3(1x2x3-0x1x2) 2x3=1/3(2x3x4-1x2x3) 3x4=1/3(3x4x5-2x3x4) ```
计算:3x(1x2+2x3+3x4+```+99x100)= ( )
A.97x98x99 B.98x99x100 C.99x100x101 D.100x101x102
观察下列各式:1X2=1/3(1x2x3-0x1x2) 2x3=1/3(2x3x4-1x2x3) 3x4=1/3(3x4x5-2x3x4) ```计算:3x(1x2+2x3+3x4+```+99x100)= ( )A.97x98x99 B.98x99x100 C.99x100x101 D.100x101x102
3*(1x2+2x3+3x4+...+99x100)
=3*1/3*(1x2x3-0x1x2+2x3x4-1x2x3+3x4x5-2x3x4+99x100x101-98x99x100)
=99x100x101
选 C