m⁴-2(m²-1/2)怎么算
m2-1/m2-2m+1÷(m-1-m+1/m-1) =(m-1)(m+1)/(m-1)² ÷[(m-1)²-(m+1)]/(m-1) =(m+1)/(m²-2m+1-m-1) =(m+1)/(m²-3m) =(√3+1)/(3-3√3) =-1/3×(√3+1)²/2 =-(4+2√3)/6 =-(2+√3)/3。
m2-1/m2-2m+1÷(m-1-m+1/m-1) =(m-1)(m+1)/(m-1)² ÷[(m-1)²-(m+1)]/(m-1) =(m+1)/(m²-2m+1-m-1) =(m+1)/(m²-3m) =(√3+1)/(3-3√3) =-1/3×(√3+1)²/2 =-(4+2√3)/6 =-(2+√3)/3。
收起