17(2-3y)-5(12-y)=8(1-7y)
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这是一个问题还是分开的啊?再问:feikai再答:/代表几分之几,*代表乘号1.3x+8y=12①14x+5y=12②②-①=11x-3y=011x=3y11/3*x=y再代入①里计得x,再代入②再问
∵3y^2-(2y+1)(y-2)=(y-5)(y-1)==>3y^2-2y^2+3y+2=y^2-6y+5==>9y==3==>y=1/3∴原方程的解是y=1/3.
x=5y=-2
5y(8-y)-3y(5-3y)+2y(7-2y)>-3940y-5y²-15y+9y²+14y-4y²>-3939y>-39y>-1
(1)方程1*5得5y+15x+85=0(3)(3)-(2)17x+68=0所以x=-4将x=-4代入1得y=-5(2x+y+z=12(1)x+2y+5z=22(2)x=4y(3)(3)分别代入(1)
根据方程式可以得出方程组:3x+2y=175x-y=-2解此方程得:x=1y=7解方程不用我说了吧,2式乘2再加上1式可以解出x
6x^4y^3+12x^3y^4-24x^2y^5提取6x^2y^3=6x^2y^3(x^2+2xy-4y^3)
移项:把y移到左边数值移到右边5y+y+5y=2-5/12+1/4-4/311y=1/2y=1/22移项:把y移到右边,数值移到左边-1/4+7/6=5y-3y11/12=2yy=11/24
(x+y)-(2x+y/2)-(3x+y/6)-(4x+y/12)-(5x+y/20)-……-(10x+y/90)=x-2x-3x-4x-..-10x+y*(1-1/2-1/6-1/12-..1/90
1.齐次通解Y特征方程为:r²-3r+2=0(r-1)(r-2)=0r=1或r=2Y=C1e^x+C2e^2x2.非齐次特解y*设y*=ay*'=y*''=02a=5a=5/2所以通解为:y
y-[3y-1]=5【y+2]y-3y+1=5y+103y=-9y=-3
因为(x-y)/(x+y)=3,则(x+y)/(x-y)=1/3则5(x-y)(x+y)-(x+y)/2(x-y)=5*3-1/(3*2)=15-1/6=89/6
11y-12-2y²=y²-7y+10-(3y²-7)18y=12+10+7=39y=39/18
(x-y)^5*(y-x)^3*(x-y)^2=-(x-y)^5*(x-y)^3*(x-y)^2=-(x-y)^(5+3+2)=-(x-y)^10
y^3+5-12y^2+2-3y^2-2分之1y^3-y^2=-1+5-12+2-3+0.5-1=-9.53x-2x^2+5+3x^2-2x-5=3-2+5+3-2-5=2再问:能写的详细一些吗?再答
设a=x+y,b=x-y原方程组为:a/2+b/3=6,即3a+2b=36,即:12a+8b=1444a-5b=12,即:12a-15b=36相减得:23b=108,得:b=108/23,再得:a=1
∵3y^2-(2y+1)(y-2)=(y-5)(y-1)==>3y^2-2y^2+3y+2=y^2-6y+5==>9y==3==>y=1/3∴原方程的解是y=1/3.希望对你有所帮助,
(2X-3y)-(5x-y)=2x-3y-5x+y=2x-5x-3y+y=(2x-5x)+(-3y+y)=-3x-2y这样写总是全过程了吧
设1/x+y=t1/x-y=v则3t+2v=17/52t-5v=16t+4v=34/56t-15v=319v=19/5v=1/5t=11/x+y=11/x-y=1/5x+y=1x-y=5x=3y=-2