9x²-49=0x^3-3=3/84(X+1)²-81=0

题目详情

9x²-49=0
x^3-3=3/8
4(X+1)²-81=0

▼优质解答

答案和解析

9x²-49=0
9x^2=49,
x^2=49/9
x1=7/3,x2=-7/3
x^3-3=3/8
x^3=27/8,
x=3/2
4(X+1)²-81=0.
(x+1)^2=81/4
x+1=9/2,x+1=-9/2
x1=9/7,x2=-11/2

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