几道解方程的题~快,很急,谢谢~~~1)(2x-1)³=642)(x²+8)³=7293)8(x-1)³=-64分之1254)根号81+25x³=-116详细过程解答,谢谢~~
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![几道解方程的题~快,很急,谢谢~~~1)(2x-1)³=642)(x²+8)³=7293)8(x-1)³=-64分之1254)根号81+25x³=-116详细过程解答,谢谢~~](/uploads/image/z/3774094-70-4.jpg?t=%E5%87%A0%E9%81%93%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%9A%84%E9%A2%98%7E%E5%BF%AB%2C%E5%BE%88%E6%80%A5%2C%E8%B0%A2%E8%B0%A2%7E%7E%7E1%EF%BC%89%EF%BC%882x-1%EF%BC%89%26sup3%3B%3D642%EF%BC%89%EF%BC%88x%26sup2%3B%2B8%EF%BC%89%26sup3%3B%3D7293%EF%BC%898%EF%BC%88x-1%EF%BC%89%26sup3%3B%3D-64%E5%88%86%E4%B9%8B1254%EF%BC%89%E6%A0%B9%E5%8F%B781%2B25x%26sup3%3B%3D-116%E8%AF%A6%E7%BB%86%E8%BF%87%E7%A8%8B%E8%A7%A3%E7%AD%94%2C%E8%B0%A2%E8%B0%A2%7E%7E)
几道解方程的题~快,很急,谢谢~~~1)(2x-1)³=642)(x²+8)³=7293)8(x-1)³=-64分之1254)根号81+25x³=-116详细过程解答,谢谢~~
几道解方程的题~快,很急,谢谢~~~
1)(2x-1)³=64
2)(x²+8)³=729
3)8(x-1)³=-64分之125
4)根号81+25x³=-116
详细过程解答,谢谢~~
几道解方程的题~快,很急,谢谢~~~1)(2x-1)³=642)(x²+8)³=7293)8(x-1)³=-64分之1254)根号81+25x³=-116详细过程解答,谢谢~~
1)(2x-1)³=64
2x-1=4
x=5/2
2)(x²+8)³=729
x^2+8=9
x^2=1
所以 x=1 或 x=-1
3)8(x-1)³=-64分之125
(x-1)^3=-125/(512)
x-1=-5/8
x=3/8
4)根号81+25x³=-116
9+25x^3=-116
25x^3=-125
x^3=-5
x=³√(-5)
1)(2x-1)³=64
2x-1=4
2x=5
x=5/2
2)(x²+8)³=729
x²+8=9
x²=1
x=1或-1
3)8(x-1)³=-64分之125
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1)(2x-1)³=64
2x-1=4
2x=5
x=5/2
2)(x²+8)³=729
x²+8=9
x²=1
x=1或-1
3)8(x-1)³=-64分之125
(2x-2)³=(-5/4)³
2x-2=-5/4
2x=3/4
x=3/8
4)根号81+25x³=-116
9+25x³=-116
25x³=-125
x³=-5
x=-3次根号5
收起
1)(2x-1)³=64 x=5/2
2)(x²+8)³=729 x=+-1
3)8(x-1)³=-64分之125 x=3/5
4)根号81+25x³=-116 x=-开三次方5
(1)2x-1=4
x=5/2
(2) x²+8=9
x²=1
x=1,-1
(3)x-1=5/4
x=9/4
(4)9+25x³=-116
x=-3次根5