(2xx+ax-y+6)-(2bxx-3x+5y-1)的值與字母x的取值無關(guān)，求代數(shù)式３(aa-2ab-bb)-(4aa+ab+bb)的值．
熱心網(wǎng)友
(2xx+ax-y+6)-(2bxx-3x+5y-1) = 2*(1-b)x^2 + (a+3)x - 6y + 7 去值與x的值無關(guān)，所以: b=1；a=-3因此：（3aa-2ab-bb)-(4aa+ab+bb) = -a^2 - 3ab - 2b^2 = 2．
(2xx+ax-y+6)-(2bxx-3x+5y-1)的值與字母x的取值無關(guān)，求代數(shù)式３(aa-2ab-bb)-(4aa+ab+bb)的值．
(2xx+ax-y+6)-(2bxx-3x+5y-1) = 2*(1-b)x^2 + (a+3)x - 6y + 7 去值與x的值無關(guān)，所以: b=1；a=-3因此：（3aa-2ab-bb)-(4aa+ab+bb) = -a^2 - 3ab - 2b^2 = 2．