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解方程 (1)x+25%x=25 (2)x﹣25%x=10 (3)x+x=20.
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设A是三角形的内角且sinA和cosA是关于x方程25x2﹣5ax﹣12a=0的两个根.1求a的值2
用配方法解方程x2+8x﹣9=0时此方程可变形为
(x+4)
2
=7
(x+4)
2
=25
(x+4)
2
=9
(x+4)
2
=﹣7
25x2﹣36=0
若25x2=36则x=
x=1是方程25x=2.5的解..判断对错
求下列各式中的x的值25x2−1=0
45x+3y・=25x2-9y2
x=1是方程25x=2.5的解..判断对错
解方程x2﹣25=0
25x2﹣49=0
方程x2-25=0的解是
x
1
=x
2
=5
x
1
=x
2
=25
x
1
=5,x
2
=-5
x
1
=25,x
2
=-25
解方程25x﹣x﹣5=29.
解方程.5x+7=42=23.6﹣x=3.252x﹣3=5842x+25x=134.
解方程60%x+25=401﹣25%x=x﹣25%x=2x+30%x=9.2.
下列解方程的过程中正确的是
x
2
=-2,解方程,得x=±
(x-2)
2
=4,解方程,得x-2=2,x=4
4(x-1)
2
=9,解方程,得4(x-1)=±3,x
1
=
,x
2
=
(2x+3)
2
=25,解方程,得2x+3=±5,x
1
=1,x
2
=-4
解方程4x2-25=0
因式分解125x2﹣81y22x3﹣2x2y+xy23x4﹣18x2+81.
分解因式xy2﹣25x=.
25x2=16.
25x2−1=0
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