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125x15x16怎么简便计算

125x15x16 =125x15x8x2 =(125x8)x(15x2) =1000x30 =30000

25*4*2*15*2 =100*2*30 =6000 望采纳,

265252859812191058636308480000000

670442572800,六千七百零四亿四千二百五十七万二千八百

1/12x13x14+1/13x14x15+1/14x15x16+1/15x16x17 =1/2(1/12x13-1/13x14+1/13x14-1/14x15+1/14x15-1/15x16+1/15x16-1/16x17) =1/2(1/12x13-1/16x17)=(16x17-12x13)/(2x12x13x16x17)=116/(2x12x13x16x17) =29/(6x13x16x17)

个位数字是0。

=20的阶乘,不知你可学过

2.432902e18

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