若√(2x+7)=3,(4x+3y)³=-8,求³√(x+y)
问题描述：
若√(2x+7)=3,(4x+3y)³=-8,求³√(x+y)
答
√(2x+7)=3,(4x+3y)³=-8,
2x+7 = 9
2x = 2
x =1
4x+3y = -2
3y = -2 -4 = -6
y = -2
求³√(x+y)
= ³√ ( 1-2)
= ³√ (-1)
= -1