x-y=36 2乘25x=40y
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![x-y=36 2乘25x=40y](/uploads/image/f/890701-61-1.jpg?t=x-y%3D36+2%E4%B9%9825x%3D40y)
求导数y=(e^x)(cosx)dy/dx=(e^x)cosx-(e^x)sinx=(e^x)(cosx-sinx)
括号应该成对,还有一个括号在哪里?能不能把你的叙述用数学的语言表达出来?
40x=2x25y40x=50yy=5/4xx+y=36x+5/4x=369/4x=36x=16y=16x5/4=202x+3y=15.54x+6y=315x+6y-4x-6y=35-31x=42x4
不用啊就是幂函数2次根号就是1/2次方所以分母是x的2分之3次方所以y=x的-2分之3次方再问:此函数是否是复合函数?若令f(x)=1/x,g(x)=2次根号下x.则f[g(x)]=y=1/[x乘(2
(Y+2)^2+根号(X+Y-1)=0(Y+2)^2与根号(X+Y-1)都大于等于0,又和为0,所以都是0Y=-2X+Y-1=0X-2-1=0X=3X乘Y=-6A
(x+y)的平方乘(2x+2y)的平方乘(3x+3y)的平方=(x+y)²×4(x+y)²×9(x+y)²=36(x+y)的6次方=36×64=2304
x=3y再答:带入再答:3.5
(y+2)2+根下x+y-1=0因为(y+2)2大于等于0根下x+y-1大于等于0又因为两式相加为0,所以两项都为0y+2=0y=-2x+y-1=0,x=3所以x乘y=-2乘3=-6
对不起说得不太清楚是(y+2)的平方
y=2x/3则xy=2x2/3y2=4x2/9所以原式=(2x2/3)/(x2+4x2/9)-(4x2/9)/(x2-4x2/9)=(2/3)/(1+4/9)-(4/9)/(1-4/9)=6/13+4
5(x+y)(x-y)-2(x+y)^2+3(x-y)^2=3(x-y)^2+5(x+y)(x-y)-2(x+y)^2=(3(x-y)-(x+y))(3(x-y)+2(x+y))=(2x-4y)(5x
16(x-y)(x-y)-25(x+y)(x+y)=[4(x-y)]²-[5(x+y)]²=(4x-4y+5x+5y)(4x-4y-5x-5y)=(9x+y)(﹣x-9y)=﹣(9
您好:(2x-y)的平方乘(2x+y)=(2x-y)(4x²-y²)=8x³-4x²y-2xy²+y³不明白,可以追问如有帮助,记得采纳,谢
=x+y的立方乘以(2倍的x+y)的立方乘以(3倍的x+y)的立方=a³乘以(2a)³乘以(3a)³=a³乘以8a³乘以27a³=8a的六次
(x^2-8x+16)+(y^2+6y+9)=(x-4)^2+(y+3)^2=0因两平方均非负,则两平方等于0.x=4,y=-3代入(x-y+4xy/(x-y))(x+y-4xy/(x+y))=259
解题思路:由A+B-3C=0,得C=1/3(A+B),将A,B代入后,合并同类项解题过程:
3乘a=3ab乘h乘2=2bhx乘y=xy2乘x=2xx乘x=x²4乘a+5乘b=4a+5bx乘x乘8-3乘x=x²-3x字母与数字相乘,可以省略乘号
[(x^4-y^4)/(x^2-2xy+y^2)]*(y-x)/(x^2+y^2)=[(x-y)(x+y)(x^2+y^2)/(x-y)^2]*(y-x)/(x^2+y^2)=[(x^2+y^2)(x
我把方法告诉你,最后的答案你自己做吧,很容易.(x+y)(x+2y)(x+3y)(x+4y)=-40(x+y)(x+4y)(x+2y)(x+3y)=-40(x^2+5yx+44)(x^2+5yx+66