y-0.4=3.6
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![y-0.4=3.6](/uploads/image/f/907032-48-2.jpg?t=y-0.4%3D3.6)
移项、得1.5y=-3系数化为一、y=-2很简单的呀
y'=1/(1+x²)
=-(xy^2)^4+3(xy^2)^3+(xy^2)^2=-27-27-3=-57
逗号表达式注意两个基本知识:1.逗号表达式的运算顺序是从左向右运算2.逗号表达式的值取逗号中最右表达式的值第一个循环:(x=0,y=1)现在看(x=3*y,x+1),x-1这个逗号表达式,首先对于(x
其次方程解设为e^(ax)代入有a^4+a^2+1=0=>a^2=e^(j2π/3)或e^(j4π/3)推出次方程的四个解为e^(jπ/3)e^(j2π/3)e^(j4π/3)e^(j5π/3)故原方
1.y-0.4y=28.82.3.5m+m=7.653.9×17+9a=369解:1y-0.4y=28.8解:3.5m+1m=7.65解:153+9a=369(1-0.4)y=28.8(3.5+1)m
0.4y+1.8-y+2.5=0.3+2/3y解-0.6y+4.3=0.3+2/3y-(19/15)y=-4y=19/60
0.4y^-0.8y=14y²-8y=102y²-4y=5y²-2y=5/2y²-2y+1=7/2(y-1)²=7/2y-1=±√7/2y=1±1/2
0.4(y-0.2)+1.5=0.7y-0.380.4y-0.08+1.5=0.7y-0.380.7y-0.4y=1.5+0.38-0.080.3y=1.8y=1.8/0.3y=6
∵令y=xt,则y'=xt'+t代入原方程,得xt'+t=t/(t-1)==>xt'=(2t-t^2)/(t-1)==>(t-1)dt/(2t-t^2)=dx/x==>2dx/x+[1/t+1/(t-
0.5x+0.7y=35x+0.4y=40化简,得5x+7y=350①5x+2y=200②①-②,得5y=150y=30将y=30代入①,得x=28.
令p=y'则y"=pdp/dy代入原式:pdp/dy+p=pydp/dy+1=ydp=(y-1)dy积分:p=(y-1)²/2+c1即dy/dx=(y-1)²/2+c12dy/[(
1.{x+y=2(1){3x-5y+18=0(2)由(1)得x=2-y(3)把(3)代入(2)得3(2-y)-5y+18=06-3y-5y+18=0-8y=-24y=-3把y=-3代入(3)得x=2-
0.4(y-0.2)+1.5=0.7y-0.380.4y-0.08=0.7y-0.380.7y-0.4y=0.38-0.080.3y=0.3y=0.3÷0.3y=1
6y-(y+2分之y+2-y分之y)除以y³-4y-2y²+8分之y=6y-[(2y-y²+2y+y²)/(4-y²)]÷y/(y-2)³=
2y''+y'-y=0特征方程:2r^2+r-1=0根为:-1,1/2y=C1e^(-x)+C2e^(x/2)
(y^2-12)/y
首先要知道逗号运算取后面那个值,所以1:x=3;y=2;2step:x=6,y=5;3step:x=15,y=14(此时y》10,所以结束)最终结果:x=15,y=14.
1.两边求导得:y'=-sin(x-y)(1-y')解得y'=sin(x-y)/[sin(x-y)-1]2.y'=-e^-xy''=e^-xy'"=-e^-x3.y'"=(e^2x)'"(sinx)+