求下列各式中的x值(1)4x²-9=0(2)5x²=125(3)2(1-x)²=8(4)7x²+3=346
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![求下列各式中的x值(1)4x²-9=0(2)5x²=125(3)2(1-x)²=8(4)7x²+3=346](/uploads/image/z/1333927-55-7.jpg?t=%E6%B1%82%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%E4%B8%AD%E7%9A%84x%E5%80%BC%EF%BC%881%EF%BC%894x%26%23178%3B-9%3D0%EF%BC%882%EF%BC%895x%26%23178%3B%3D125%EF%BC%883%EF%BC%892%EF%BC%881-x%EF%BC%89%26%23178%3B%3D8%EF%BC%884%EF%BC%897x%26%23178%3B%2B3%3D346)
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求下列各式中的x值(1)4x²-9=0(2)5x²=125(3)2(1-x)²=8(4)7x²+3=346
求下列各式中的x值(1)4x²-9=0(2)5x²=125(3)2(1-x)²=8(4)7x²+3=346
求下列各式中的x值(1)4x²-9=0(2)5x²=125(3)2(1-x)²=8(4)7x²+3=346
4x²-9=0
(2x)²=9
2x=±3
x=±1.5
5x²=125
x²=25
x=±5
2(1-x)²=8
(1-x)²=4
1-x=±2
x=1±2
x1=3 x2=-1
7x²+3=346
7x²=343
x²=49
x=±7
(1)4x²-9=0
(2x)^2=9
2x=±3
x=3/2或x=-3/2
(2)5x²=125
x^2=125/5
x^2=25
x=5或x=-5
(3)2(1-x)²=8
(1-x)^2=4
1-x=±2
x=1±2
x=3或x=-1
(4)7x²+3=346
7x^2=343
x^2=49
x=7或x=-7
1.x=1.5; -1.5 2.x=5 ;-5 3. x=-1 ;3 4.x=49 ;-49
1.5 5 -1 7
分别是±3/2,±5,-1或3,±7
(1)4x²-9=0
4x²=9
x²=9/4
x=±3/2
(2)5x²=125
x²=25
x=±5
(3)2(1-x)²=8
(1-x)²=4
1-x=±2
x=1±2
x1=3
x2=-1
(4)7x²+3=346
7x²=343
x²=49
x=±7
(1)x=4分之9 (2)x=25 (3)x=-3 (4)x=49