Question

数学题代数

啊

Answer 1

1.=(3/4*a^4*b^7+1/2*a^3*b^8-1/9*a^2*b^6)/(1/9*a^2*b^6)
=27/4*a^2*b+9/2*a*b^2-1
=9/2*ab(3/2*a+b)-1
=9/2*(1/2)*(-4)[(3/2)*1/2-4]-1
=-9*(-13/4)-1=-121/4
2.=2a+4/a-3
当a=±1、a=±2、a=±4时代数式的值为整数

Answer 2

1.=(3/4*a^4*b^7+1/2*a^3*b^8-1/9*a^2*b^6)/(1/9*a^2*b^6)
=27/4*a^2*b+9/2*a*b^2-1
=9/2*ab(3/2*a+b)-1
=9/2*(1/2)*(-4)[(3/2)*1/2-4]-1
=-9*(-13/4)-1=-121/4
2.=2a+4/a-3
当a=±1、a=±2、a=±4时代数式的值为整数
cao出点难的题目会死啊