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求下列各式中X的值; (1) (X-1)²=4 (2)1/3X³-1/8=1
2个回答
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(X-1)²=4
(X-1)²-4 =0
(x-1+2)(x-1-2)=0
(x+1)(x-3)=0
x=-1或x=3
1/3X³-1/8=1
1/3X³=9/8
X³=27/8
X³=(3/2)³
x=3/2
(X-1)²-4 =0
(x-1+2)(x-1-2)=0
(x+1)(x-3)=0
x=-1或x=3
1/3X³-1/8=1
1/3X³=9/8
X³=27/8
X³=(3/2)³
x=3/2
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