4/51+6/51+8/51+10/51+12/51+14/51+16/51=2*(2/51+3/51+4/51+5/51+6/51+7/51+8/51)=(2/51)*(2+3+4+5+6+7+8)=(2/51)*35=70/51
4/51+6/51+8/51+10/51+12/51+14/51+16/51怎么写乘法算式
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