已知3x+3= - 8y,求(3x+8y)的平方-(6x+16y)分之3的值
问题描述:
已知3x+3= - 8y,求(3x+8y)的平方-(6x+16y)分之3的值
过程清晰
答
因为3x+3= - 8y,
所以3x+8y=-3,
所以(3x+8y)^2-3/(6x+16y)
=(-3)^2-3/[2(3x+8y)]
=9-3/[2*(-3)]
=9-3/(-6)
=9+0.5
=9.5.