1.-1的立方根+(-1)的三次方的立方根+(-1)²的立方根2.(2x+3y-1)(1+2x-3y)计算
问题描述:
1.-1的立方根+(-1)的三次方的立方根+(-1)²的立方根
2.(2x+3y-1)(1+2x-3y)
计算
答
-1的立方根+(-1)的三次方的立方根+(-1)²的立方根
=(-1+-1)^3+1^3
=-8+1=-7
(2x+3y-1)(1+2x-3y)
=(2x+3y-1)(2x-(3y-1))
=4x^2-(3y-1)^2
=4x^2-9y^2+6y-1
答
.-1的立方根+(-1)的三次方的立方根+(-1)²的立方根
=-1+(-1)+1
=-1
2.(2x+3y-1)(1+2x-3y)
=[2x+(3y-1)][2x-(3y-1)]
=4x^2-(3y-1)^2
=4x^2-9y^2+6y-1