问题
解答题
3（x+2）3+9=90．
答案
3（x+2）3+9=90，
3（x+2）3=81，
（x+2）3=27，
x+2=3，
x=1．
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3（x+2）3+9=90．
3（x+2）3+9=90，
3（x+2）3=81，
（x+2）3=27，
x+2=3，
x=1．
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