2-0.2(y-2)=x+0.1/0.5y-0.2/0.4＝0.2-x/0.2

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 解方程组：（0.2x+0.1y）/2- （4x-y）/10=（x-y）/5+ (3x+0.5y)/30 (3x+2y-1)/8=3-(0.8x-5y)/41=-= 2-0.2(y-2)=x+0.1/0.5y-0.2/0.4＝0.2-x/0.2 （x+3y)²-2（x-y)（x+y)+(x+y)²其x=0.5,y=-2 解方程组：①4x+3y-5=0,x-2y-4=0.②5x-2=2（y-1）,2（x-2）+（y-1）③0.2x+0.5y=0.2,0.4x+0.1y=0.4④3x-13y=-12,x+3y=2 A={（x,y)|y>=0.5|x-2|},B={(x,y)|y mathematica软件,已知y[x],Y=f1(x),X(x)=f2(x),如何plot Y[X]?y[x_] := x + 9.81/2*x*xk=1X[x] = x - k*y'[x]/(1 + (y'[x])^2)^0.5Y[x] = y[x] + k/(1 + (y'[x])^2)^0.5Plot[{y[x],Y[X],},{x,0,2}] 4分之x－y＝﹣1 x＋4y＝4,求x,y 0.2x＋0.5y＝5分之1 0.4x＋0.1y＝5分之2,求x,y 如何解带分母的二元一次方程组?1.x-1/0.5+y-1/0.2=2 1.2(x-y)/3-x+y/4=-12.x+y=2 2.6(x+y)-4(2x-y)=16 填空：x-y/x+y=( )/x^2-y^2 （x-y)2•(y-x)³(x-y)=? x-y=2 那么-2x-2y=多少[（2x=y)的平方-（2x+y)(2x-y)-y(5x+y)]/(0.5y),其中x-y=2 matlab y=[ ]; x=0:0.1:2; y=[y,cos(x)]; plot(x,y) 其中y=[ ]和y=[y,cos(x)]; 啥意 0.1y=2x,5x+y=5 0.1y =2x 5x+y=5 y+y'-2y=2x matlab画二元函数图像z = (x/(x+y) + 1.96*1.96/(2*(x+y)) - 1.96 * ((x/(x+y)*(1-x/(x+y))+1.96*1.96/(4*(x+y)))/(x+y))^0.5)/(1+1.96*1.96/(x+y))该怎么画 1/2x=0.5y则y/x()/().