(4y/9):(5y/9-10)=(0.8*5x):(1.2*4x)具体怎么解
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[T,Y]=ode45(@rigid,[0 1],[rand(15,1)]);plot(T,Y(:,1),'-',T,Y(:,2),'-.',T,Y(:,3),'.',T,Y(:,4),'-',T,Y(:,5),'-.',T,Y(:,6),'.',T,Y(:,7),'-',T,Y(:,8),'-.',T,Y(:,9),'.',T,Y(:,10),'-',T,Y(:,11),'-.',T,Y(:,12),'-.',T,Y(:,13),'.',T,Y(:,14),'-',T,Y(:,15),'.')
maths(right,very esay①(1-y)/2=2-[(2y-1)/3]②21%x-5%=5%x+0.11③(2y-1)/3-(10y+1)/6=(2y+1)/4-1④1/3[3y-(10-7y)/2)]-1/2[2y-9(2y+2)/3)]=y/2-1⑤(0.4y+0.9)/0.5-(0.03+0.02y)/0.03=(y-5)/2
已知x^2+9y^2-2x-6y+2=0,求{-(xy/(x-y)^2}^4*(y^2-xy/x)^3*x^4/y^10/(x/xy-y^2)^5的值
8y-4=12-5y+9y
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y²+4x-18y+13=0.
{5(x-3y)-6=2x+1 3(x+6y)+4=9y+19 {3分之2(x-y)=4分之x+y-1 6)x+y)=4(2x-y)+16
先化简,再求值:(y-2)(2y²-3y+9)-y(y²-2y+15),其中Y²-4Y-4=0.
5y*4y=()
解下列方程 {x+y=9 (1) {(10y+x)-(10x+y)=9 (2){(10x+y)-3(x+y)=23 (1){5(x+y)+1=10x+y (2){x+y=9 (1){(10y+x)-(10x+y)=9 (2) {(10x+y)-3(x+y)=23 (1){5(x+y)+1=10x+y (2)
实数x,y满足x+2y(这个y就是y)=4,则3x+9y(这个x,y是指数)的最小值为
啊啊啊啊!做题代数式9-6y-4y*y=7,则2y*y+3y+7的值是( )
解(y-3分之2y+y+3分之y)×y分之y²-9
(1)(x+y)^2-(x+y)^3(2)(x-y)-(x-y)^3(3)(x-y)^2-(y-x)^3(4)2(x-y)-3(y-x)^2(5)4ab(a=b)^2-6a^2b(a+b)(6)(x+y)^2(x-y)+(x+y)(x-y)^2(7)2a(a-3)^2-6a^2(3-a)+8a(a-3)(8)24xy^2z^2(x+y-z)-32xyz(z-x-y)^2+8xy(z-x-y)(9)(a-b)(b-a)^n(b-a)^2n-1 [两解)(10)2^2=3,2^b
(2y+5/3y)²-5y×(5/3y+y)=4 求y的值.(2y+5/3y)的平方-5y×(5/3y+y)=4
(3y-1)/4-1=(5y-7)/6 9y-3-3=10y-14 9y-10y=-14+3+3 -y=-8 y=8
1、求下列微分方程的通解:(1)2y‘’+y‘-y=2ex (2)2y‘’+5y‘=5x2-2x-1 (3)y‘’-6y‘+9y=e3x(x+
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
已知4x²+y²-4x-6y+10=0求(2/3x(√9x)+(y²√x/y³)×(x²√1/x×5x√y/x)的值