5合并同類項(xiàng)練習(xí)題,共5題,
①求k為何值時(shí),代數(shù)式x²-3kxy-3y²-1/3xy-8中不含xy的項(xiàng).
②說(shuō)明代數(shù)式與3/2a²bc-3ab²-3/2a²bc+4ab²的值與c的取值無(wú)關(guān).
③已知2x²+xy=10,3y²+2xy=6,求4x²+8xy+9y²的值.
④當(dāng)x為-3時(shí),代數(shù)式ax^5-bx³+cx-6的值為17,求當(dāng)x為3時(shí)這個(gè)代數(shù)式的值.
⑤如果t1/|t1|+t2/|t2|+t3/|t3|=1,求|t1t2t3|/t1t2t3的值.