若√(2x+7)=3,(4x+3y)³=-8,求³ - 知识问答

若√(2x+7)=3,(4x+3y)³=-8,求³√(x+y)

1个回答

√(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

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