5个回答
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1. 4(x+3)²=25(x-2)²
4(x+3)²-25(x-2)²=0
[2(X+3)+5(X-2)][2(X+3)-5(X-2)] =0
[2X+6+5X-10][2X+6-5X+10]=0
(7X-4)(-3X+16)=0
X=4/7或X=16/3;
2. (1+√2)x²-(1-√2)x=0
x[(1+√2)x-(1-√2)]=0
X=0或
X=(1-√2)/(1+√2)
=(1-√2)²/(1-2)
=-(1-√2)²
=-3+2√2
X=0或X=-3+2√2
4(x+3)²-25(x-2)²=0
[2(X+3)+5(X-2)][2(X+3)-5(X-2)] =0
[2X+6+5X-10][2X+6-5X+10]=0
(7X-4)(-3X+16)=0
X=4/7或X=16/3;
2. (1+√2)x²-(1-√2)x=0
x[(1+√2)x-(1-√2)]=0
X=0或
X=(1-√2)/(1+√2)
=(1-√2)²/(1-2)
=-(1-√2)²
=-3+2√2
X=0或X=-3+2√2
展开全部
1,解方程:
4(x+3)²=25(x-2)²
4(x+3)^2-25(x-2)^2=0
[2(x+3)+5(x-2)][2(x+3)-5(x-2)]=0
[7x-4][16-3x]=0
7x-4=0 x1=4/7
16-3x=0 x2=16/3 .,
2,
(1+√2)x²-(1-√2)x=0
x[(1+√2)x-(1-√2)]=0
x1=0
x2=(1-√2)/(1+√2)
4(x+3)²=25(x-2)²
4(x+3)^2-25(x-2)^2=0
[2(x+3)+5(x-2)][2(x+3)-5(x-2)]=0
[7x-4][16-3x]=0
7x-4=0 x1=4/7
16-3x=0 x2=16/3 .,
2,
(1+√2)x²-(1-√2)x=0
x[(1+√2)x-(1-√2)]=0
x1=0
x2=(1-√2)/(1+√2)
追问
回答的很好了,可惜不是最快的,谢谢!!
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祝学习进步
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4(x+3)²=25(x-2)²
4(x+3)²-25(x-2)²=0
[2(x+3)]²-[5(x-2)]²=0
[2(x+3)+5(x-2)][2(x+3)-5(x-2)]=0
[2x+6+5x-10][2x+6-5x+10]=0
[7x-4][16-3x]=0
x1=4/7
x2=16/3
(1+√2)x²-(1-√2)x=0
x[(1+√2)x-(1-√2)]=0
x1=0
x2=(1-√2)/(1+√2)=[(1-√2)(√2-1)]/[(√2+1)(√2-1)]=2√2-3
4(x+3)²-25(x-2)²=0
[2(x+3)]²-[5(x-2)]²=0
[2(x+3)+5(x-2)][2(x+3)-5(x-2)]=0
[2x+6+5x-10][2x+6-5x+10]=0
[7x-4][16-3x]=0
x1=4/7
x2=16/3
(1+√2)x²-(1-√2)x=0
x[(1+√2)x-(1-√2)]=0
x1=0
x2=(1-√2)/(1+√2)=[(1-√2)(√2-1)]/[(√2+1)(√2-1)]=2√2-3
追问
回答的很好了,可惜不是最快的,谢谢!!
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展开全部
4(x+3)2-25(x-2)2=0
[2(x+3)+5(x-2)][2(x-3)-5(x-2)]=0
所以2(x+3)+5(x
-2)=0huo2(x-3)-5(x-2)=0解出即可
x[(1+√2)x-(1-根号2)】=0
所以x=0或1+√2)x-(1-根号2)=0解出即可
[2(x+3)+5(x-2)][2(x-3)-5(x-2)]=0
所以2(x+3)+5(x
-2)=0huo2(x-3)-5(x-2)=0解出即可
x[(1+√2)x-(1-根号2)】=0
所以x=0或1+√2)x-(1-根号2)=0解出即可
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