解方程5x-2（20-x）=64, 解方程5x-2（20-x）=64
解方程5x-2（20-x）=64
wangxiuying00 解方程5x-2（20-x）=64
5x-2（20-x）=645x-40+2x=647x=104x=104/72+3+5+7+9+8✘5=？, 2+3+5+7+9+8✘5=？
2+3+5+7+9+8✘5=？
匿名 2+3+5+7+9+8✘5=？
66
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66
热心网友配方法解方程 2y^2+5y-3=0 x^2+2x=2 t^2+5y-3=0 2x^2-3x+1/8=0 3t^2-2t-1=0 p(p-8)=16_百度知道
配方法解方程 2y^2+5y-3=0 x^2+2x=2 t^2+5y-3=0 2x^2-3x+1/8=0 3t^2-2t-1=0 p(p-8)=16
提问者采纳
2y& + 5y - 3 = 0y& + (5/2)y - (3/2) = 0y& + (5/2)y + (5/4)& - 25/16 - 24/16 = 0( y + 5/4 )& - 49/16 = 0( y + 5/4 - 7/4 )( y + 5/4 + 7/4 ) = 0( y - 2/4 )( y + 12/4 ) = 0( y - 1/2 )( y + 3 ) = 0解程y1 = -3 y2 = 1/2x& + 2x = 2x& + 2x + 1 = 2 + 1( x + 1 )& = 3x + 1 = ±√3解程x1 = -1 - √3 x2 = -1 + √3y& + 5y - 3 = 0y& + 5y + (5/2)& - 25/4 - 12/4 = 0( y + 5/2 )& - 37/4 = 0( y + 5/2 - √37 /2 )( y + 5/2 + √37 /2 )解程y1 = -5/2 + √37 /2 y2 = -5/2 - √37 /22x& - 3x + 1/8 = 0x& - (3/2)x + (3/4)& - 9/16 + 1/16 = 0( x - 3/4 )& - 8/16 = 0( x - 3/4 )& - ( 2/4 )& = 0( x - 3/4 - √2 /2 )( x - 3/4 + √2 /2 ) = 0解程x1 = 3/4 + √2 /2 x2 = 3/4 - √2 /23t& - 2t - 1 = 0t& - (2/3)t + (1/3)& - 1/9 - 1/3 = 0( t - 1/3 )& - 1/9 - 3/9 = 0( t - 1/3 )& - (2/3)& = 0( t - 1/3 - 2/3 )( t - 1/3 + 2/3 ) = 0( t - 1 )( t + 1/3 ) = 0解程t1 = 1 t2 = -1/3p( p - 8 ) = 16p& - 8p + 4& = 16 + 16( p - 4 )& = 16 X 2( p - 4 )& = ±(4√2)&p - 4 = 4√2解程p1 = 4 + 4√2 p2 = 4 - 4√2
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2Y∧2 +8 Y-1 = 0 解决：△= B ^ 2-4AC = 64 +4 * 2 = 72
Y1 = -4 2/2平根+3倍 BR /& Y2 = -4-3倍2/2 x∧2-2.4-13 = 0 解决案平根：△= B ^ 2-4AC = 4 + 4 * 13 = 56
X1 = 1 +<img class="word-replace" src="/api/getdecpic?picenc=0af
X1 = 1根 - 14 2倍∧2-3X +1 / 8 = 0 解决案：△= B ^ 2-4AC = 2
X1平根9-4 * 2 * 1/8 = 8
X1 = 3 +2倍= 3-2倍平<img class="word-replace" src="/api/getdecpic?picenc=0af 3/2t根∧2 +4 T = 1 解决案：△= B ^ 2-4AC = 16 +4 * 3/2 = 22
T1 = -4 11
T 2平根+2倍= 11平根-4-2
x1和x2在哪里
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出门在外也不愁2(x-3.64)=x-22.8解方程_百度知道
2(x-3.64)=x-22.8解方程
2（x-3.64)=x-22.82x-7.28=x-22.82x-x=-22.8+7.28x=-15.52
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出门在外也不愁8x(x+3.2)=64.8这道题怎么解方程?_百度作业帮
8x(x+3.2)=64.8这道题怎么解方程?
这是不是初中生的代数题？
一元二次方程解方程的根，根是定值，和方程的型式有关。
8x(x+3.2)=64.8x(x+3.2)=8.1x&#178;+3.2x-8.1=0x&#178;+3.2x=8.1x&#178;+3.2x+2.56=8.1+2.56(x+1.6)&#178;=10.66x=-1.6±根号10.66
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