··0.4y+0.9/0.5-y-5/2=0.3+0.2y/0.3求y
初一数学解方程:(0.4y+0.9/0.5)-(y-5/2)=0.3+0.2y/0.3
y·y''=1+y'^2求通解
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给位懂matlab的朋友们急求z=0.8-(0.3x^2+x+y^2+y-0.05)*(0.5+y)/(0.55+y+y
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求通解(1+x)y'-y=(1+x)∧2·y∧(-1)
求y'=y/(y-x)