..全答再给203a^2-a(3a-5b)-b(2a-b)^2.计算(a+3)^2*(a^2+9)^2*(a-3)^2.计算(2a^3b^3-3b)*(-1/2b^2).计算已知x^2-3x+1=0(x不等于0)求下列的值(1) x^2+1/x^2(2) (x^4+x^2+1)/(x^2)
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![..全答再给203a^2-a(3a-5b)-b(2a-b)^2.计算(a+3)^2*(a^2+9)^2*(a-3)^2.计算(2a^3b^3-3b)*(-1/2b^2).计算已知x^2-3x+1=0(x不等于0)求下列的值(1) x^2+1/x^2(2) (x^4+x^2+1)/(x^2)](/uploads/image/z/14192890-34-0.jpg?t=..%E5%85%A8%E7%AD%94%E5%86%8D%E7%BB%99203a%5E2-a%283a-5b%29-b%282a-b%29%5E2.%E8%AE%A1%E7%AE%97%28a%2B3%29%5E2%2A%28a%5E2%2B9%29%5E2%2A%28a-3%29%5E2.%E8%AE%A1%E7%AE%97%282a%5E3b%5E3-3b%29%2A%28-1%2F2b%5E2%29.%E8%AE%A1%E7%AE%97%E5%B7%B2%E7%9F%A5x%5E2-3x%2B1%3D0%28x%E4%B8%8D%E7%AD%89%E4%BA%8E0%29%E6%B1%82%E4%B8%8B%E5%88%97%E7%9A%84%E5%80%BC%281%29+x%5E2%2B1%2Fx%5E2%282%29+%28x%5E4%2Bx%5E2%2B1%29%2F%28x%5E2%29)
..全答再给203a^2-a(3a-5b)-b(2a-b)^2.计算(a+3)^2*(a^2+9)^2*(a-3)^2.计算(2a^3b^3-3b)*(-1/2b^2).计算已知x^2-3x+1=0(x不等于0)求下列的值(1) x^2+1/x^2(2) (x^4+x^2+1)/(x^2)
..全答再给20
3a^2-a(3a-5b)-b(2a-b)^2.计算
(a+3)^2*(a^2+9)^2*(a-3)^2.计算
(2a^3b^3-3b)*(-1/2b^2).计算
已知x^2-3x+1=0(x不等于0)求下列的值
(1) x^2+1/x^2
(2) (x^4+x^2+1)/(x^2)
..全答再给203a^2-a(3a-5b)-b(2a-b)^2.计算(a+3)^2*(a^2+9)^2*(a-3)^2.计算(2a^3b^3-3b)*(-1/2b^2).计算已知x^2-3x+1=0(x不等于0)求下列的值(1) x^2+1/x^2(2) (x^4+x^2+1)/(x^2)
3a^2-a(3a-5b)-b(2a-b)^2.计算
=3a^2-3a^2+5ab-4a^2b+4ab^2-b^3
=5ab-4a^2b+4ab^2-b^3
(a+3)^2*(a^2+9)^2*(a-3)^2.计算
=[(a-3)(a+3)(a^2+9)]^2
=[(a^2-9)(a^2+9)]^2
=(a^4-81)^2
=a^8-162a^4+6561
(2a^3b^3-3b)*(-1/2b^2).计算
=-a^3b^5+(3/2)b^3
x^2-3x+1=0
x不等于0
所以两边除以x
x-3+1/x=0
x+1/x=3
(1) x^2+1/x^2
x+1/x=3
两边平方
x^2+2+1/x^2=9
x^2+1/x^2=7
(2) (x^4+x^2+1)/(x^2)
=x^2+1+1/x^2
=7+1=8