由韋達定理,分子減分母隻剩y^3與y^兩項:
(2+3+4+5)y^3+(2*3*4+2*3*5+2*4*5+3*4*5)y = 0
14y^3+ 154y = 0
由韋達定理,分子減分母隻剩y^3與y^兩項:
(2+3+4+5)y^3+(2*3*4+2*3*5+2*4*5+3*4*5)y = 0
14y^3+ 154y = 0
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