(5Y+1)/6=(9Y+1)/8-(1-Y)/3
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y (3y^2+8y-3)-6y(3y+2y-1)+9y
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(y-2)(y^2-6y-9)-y(y^2-2y-15),其中y=1/2.先化简再求值.
(3y-1)/4-1=(5y-7)/6 9y-3-3=10y-14 9y-10y=-14+3+3 -y=-8 y=8
已知(1/x)-(1/y)=5,求(6x+7xy-6y)/(8y-9xy-8y)
(5y+1)÷6=(9y+1)÷8-(1-y)÷3
5y+1/6=9y+1/8-1-y/3
(5Y+1)/6=(9Y+1)/8-(1-Y)/3
解一元一次方程5y+1/6 = 9y+1/8 - 1-y/3
y- 2y+1/2=9- 8-y/4
y-2y+1/2=9-8-y/4
y''-5y'+6y=3x+1通解
通分 y+3/y*y-6y+9,1/2y+6,y-1/y*y-9
y(y-2)²-y(y+3)(y-5) y=1/2 化简求值
y(y-2)²-y(y+3)(y-5) y=1/2 化简求值
y(y-2)²-y(y+3)(y-5) y=1/2 化简求值
计算：[(y+1)/(y^2-4y+3)减去(y-2)/(y^2-6y+9)]除以(y-5)/(y-1)
常微分方程的通解dy/dx=(x-y+1)/(x+y-3)y^4=2y^n+y=0y''+6y'+9y=e^(-3x)y''+y'-2y=4e^(2x)