计算:(6/5)a^3x^4-0.9ax^3÷(3/5)ax^3
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计算:(6/5)a^3x^4-0.9ax^3÷(3/5)ax^3
计算:〖(x-2分之x+2)^2-2+(x+2分之x-2)^2〗÷(x-2分之x+2 - x+2分之x-2)
化简求值:(a^2-1)/(a-1)-〖根号下(a^2-2a+1)/(a^2-a)〗,其中a=2-根号3
计算:〖(x-2分之x+2)^2-2+(x+2分之x-2)^2〗÷(x-2分之x+2 - x+2分之x-2)
化简求值:(a^2-1)/(a-1)-〖根号下(a^2-2a+1)/(a^2-a)〗,其中a=2-根号3
计算:(6/5)a^3x^4-0.9ax^3÷(3/5)ax^3
=(6/5)a^3x^4-9/10*5/3
=(6/5)a^3x^4-3/2
计算:〖(x-2分之x+2)^2-2+(x+2分之x-2)^2〗÷(x-2分之x+2 - x+2分之x-2)
令(x-2分之x+2)=t
上式=〖t^2-2+(1/t)^2〗÷(t -1/t)
=(t -1/t)^2÷(t -1/t)
=(t -1/t)
=(x+2/x-2) -(x-2/x+2)
=((x+2)^2-(x-2)^2)/(x+2)(x-2)
=(x^2+4x+4-x^2+4x-4)/(x+2)(x-2)
=8x/(x^2-4)
化简求值:(a^2-1)/(a-1)-〖根号下(a^2-2a+1)/(a^2-a)〗,其中a=2-根号3
=(a+1)(a-1)/(a-1)-〖根号下(a-1)^2/a(a-1)〗
=(a+1)-〖(a-1)^2/a(a-1)〗
a=2-根号3
a-1=2-根号3-1=1-根号3
=(6/5)a^3x^4-9/10*5/3
=(6/5)a^3x^4-3/2
计算:〖(x-2分之x+2)^2-2+(x+2分之x-2)^2〗÷(x-2分之x+2 - x+2分之x-2)
令(x-2分之x+2)=t
上式=〖t^2-2+(1/t)^2〗÷(t -1/t)
=(t -1/t)^2÷(t -1/t)
=(t -1/t)
=(x+2/x-2) -(x-2/x+2)
=((x+2)^2-(x-2)^2)/(x+2)(x-2)
=(x^2+4x+4-x^2+4x-4)/(x+2)(x-2)
=8x/(x^2-4)
化简求值:(a^2-1)/(a-1)-〖根号下(a^2-2a+1)/(a^2-a)〗,其中a=2-根号3
=(a+1)(a-1)/(a-1)-〖根号下(a-1)^2/a(a-1)〗
=(a+1)-〖(a-1)^2/a(a-1)〗
a=2-根号3
a-1=2-根号3-1=1-根号3
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