tarzan+x+of+shame

暴茜窦1186∫x^5/(1+x^2)怎么算 -
姜凤柯15873242892 ______ x^5/(1+x^2)=[x(1+x^2)^2-2x^3-x]/(1+x^2)=x(1+x^2)-(2x^3+x)/(1+x^2)=x+x^3-[2x(x^2+1)-x]/(1+x^2)=x+x^3-2x+x/(1+x^2)=(1/4)(x^4)'-(1/2)(x^2)'-(1/2)(x^2+1)'/(1+x^2) ∫x^5/(1+x^2)dx=x^4/4-x^2/2-ln(1+x^2)/2+C

暴茜窦1186求函数y=|x - 3|+|x+1|取值范围 -
姜凤柯15873242892 ______ x≥3 y=x-3+x+1=2x-2≥4 -1<x<3 y=3-x+x+1=4 x≤-1 y=3-x-x-1=-2x+2≥4 y≥4

暴茜窦1186计算:x的二次方+(x的二次方+x)+(x的二次方*0.5)=318 -
姜凤柯15873242892 ______ x的二次方+(x的二次方+x)+(x的二次方*0.5)=318(1+1+0.5)x²+x-318=02.5x²+x-318=05x²+2x-636=0 x=(-1±√3181)/5

暴茜窦1186设z=In(1+x²+y²),则全微分dz= - ---- -
姜凤柯15873242892 ______ ∂z/∂x=2x/(1+x²+y²) ∂z/∂y=2y/(1+x²+y²) 所以 dz=2xdx/(1+x²+y²)+2ydy/(1+x²+y²)

暴茜窦1186x+(x+10°)+180° - (x+70°)=? -
姜凤柯15873242892 ______ x+(x+10°)+180°-(x+70°)=x+x+10°+180°-x-70°=x+120°

暴茜窦1186求积分[(1 - x)/(1+x)](1/x)dx
姜凤柯15873242892 ______ 展开全部(1-x)/(1+x) (1/x)=1/(x+x^2) -1/(1+x)=(1/x-1/(x+1)) -1/(x+1)=1/x -2/(x+1) 所以积分得lnx -2ln(x+1) +c

暴茜窦1186化简丨3 - x丨;丨x+1丨+丨x+2丨 -
姜凤柯15873242892 ______ 当x<=3时,|3-x|=3-x 当x>3时,|3-x|=x-3 当x<=-2时,原式=-x-1+(-x-2)=-2x-3 当-2<x<=-1时,原式=-x-1+x+2=1 当-1<x时,原式=x+1+x+2=2x+3

暴茜窦1186不等式2x - 1的绝对值+x+2的绝对值<4的解集为 -
姜凤柯15873242892 ______ |2x-1|+|x+2||2x-1|把绝对值打开,出现4种情况: (1)2x-12x-1x(2) 2x-12x-1x(3)-2x+1-2x+1x>-1 (4)-2x+1-2x+1x>-5/3 综上所述,x的范围是 -1

暴茜窦1186...' (x)=?2.if f(x)=ln[x+4+e^( - 3x)],then f ' (0) is?3.if f(x)=[e^(2x)]/2x,then f ' (x)=?4.if f=Arc tan(cosx),then dy/dx=?5.if g(x)=3^√(x - 1) and f(x) is the inverse function of ... -
姜凤柯15873242892 ______[答案] 1.lnx^2+2/x 2..0 3.(1-2x)e^2x/(2x^2) 4.sinx/(x^2+1) 5.f'(x)=1/g'(x)=2/3*(x-1)^(-1/2) 6.==|看不懂了

暴茜窦1186用matlab做双重积分时,老是错误. G = @(x,y)(tan(x.^2+y.^2))/(1+x+y); I = dblquad(G,0,pi/2,0,pi/3); -
姜凤柯15873242892 ______ G = @(x,y)(tan(x.^2+y.^2))./(1+x+y); I = quad2d(G,0,pi/2,0,pi/3) Warning: Reached the maximum number of function evaluations (2000). The result fails the global error test. > In quad2d at 248 I = 0.3324========================= G = @(x,y)(tan(x.^2+y.^2))./(1+x+y); I = dblquad(G,0,pi/2,0,pi/3)