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1x3+3x5+5x7+7x9+......+29x31
1x3x5+4x6x8+7x9x11+
1x3+3x5+5x7
1x3/1+3x5/1+5x7/1+…+17x19/1
1x3x3=7-11
1/3x3/4÷(3/4-5/12)
1x3/1+2x4/1+3x5/1
1/3x+55=3/4x
1x3+3x5+5x7+7x9+......+97x99的结果是奇数还是偶数
1x3+2x4=1()3()2()4
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