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.97x98x99B.98x99x100C.99x100x101D.100x101x102...
计算:3x(1x2+2x3+3x4+```+99x100)= ( )
A.97x98x99 B.98x99x100 C.99x100x101 D.100x101x102 展开
A.97x98x99 B.98x99x100 C.99x100x101 D.100x101x102 展开
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