【化简求值】(2x+1)(x-2)-(-3x+1)(-3x-1),其中x=-2.
问题描述:
【化简求值】(2x+1)(x-2)-(-3x+1)(-3x-1),其中x=-2.
答
(2x+1)(x-2)-(-3x+1)(-3x-1)
=2x²-4x-x-2+9x²-1
=11x²-5x-3
=11x4-5x(-2)-3
=44+20-3
=615x(-2)不是等于10吗11x4-5x(-2)-3 =44+10-3 =51点快了抱歉祝学习进步,望采纳~~