1x2+2x3+3x4+4x5+5x6---+99x100=?
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解:1x2+2x3+3x4+4x5+5x6+99x100等于( 9970 )
∵已知需求出1x2+2x3+3x4+4x5+5x6+99x100等于多少
∴1x2+2x3+3x4+4x5+5x6+99x100
= 2 + 6 + 12 + 20 + 30 + 9900
= 8 + 12 + 20 + 30 + 9900
= 20 + 20 + 30 + 9900
= 40 + 30 + 9900
= 70 + 9900
= 9970
答:1x2+2x3+3x4+4x5+5x6+99x100等于9970
∵已知需求出1x2+2x3+3x4+4x5+5x6+99x100等于多少
∴1x2+2x3+3x4+4x5+5x6+99x100
= 2 + 6 + 12 + 20 + 30 + 9900
= 8 + 12 + 20 + 30 + 9900
= 20 + 20 + 30 + 9900
= 40 + 30 + 9900
= 70 + 9900
= 9970
答:1x2+2x3+3x4+4x5+5x6+99x100等于9970
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