数学题目,,,,,,各位学霸们,大神们,帮帮忙啊。。。。。。拜托了……,,。,,…………
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3(1)。3X^2+5X=0
X(3X+5)=0
X1=0, X2=-5/3.
(2). (2a-1)^2=0
a1=a2=1/2.
(3) (2x-5)^2=9
(2x-5)^2-9=0
(2x-5+3)(2x-5-3)=0
(2x-2)((2x-8)=0
(x-1)(x-4)=0
x1=1, x2=4.
(4). 4x^2-(x-1)^2=0
[2x+(x-1)][2x-(x-1)]=0
(3x-1)(x+1)=0
x1=1/3, x2=-1.
X(3X+5)=0
X1=0, X2=-5/3.
(2). (2a-1)^2=0
a1=a2=1/2.
(3) (2x-5)^2=9
(2x-5)^2-9=0
(2x-5+3)(2x-5-3)=0
(2x-2)((2x-8)=0
(x-1)(x-4)=0
x1=1, x2=4.
(4). 4x^2-(x-1)^2=0
[2x+(x-1)][2x-(x-1)]=0
(3x-1)(x+1)=0
x1=1/3, x2=-1.
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