y=2x³+×+3 则y′=作业帮-搜答案-智慧作业帮

N={(1,1)},M={(x,y)|y-3=x-2},即M={(x,y)|y-x-1=0},CIM即为除直线外的所有的（x,y),CIN即为除（1,1）外的（x,y),所以(CIM)∩（(CIM)）

由(1)得3x+3y+2x-2y=365x+y=36(3)由(2)得4x+4y-3x+3y=-20x+7y=-20(4)(3)×7-(4)得34x=272∴x=8把x=8代入(3)得y=-4∴x=8y

3x=4Y.X/Y=4/3,x-y)/y=(X/Y)-1=1/3,（3x+2y)/(2x+3y)=(4Y+2y)/(8/3y+3y)=18/17（因为3x=4Y,2x=8/3y）再问：若3X-4Y=0

{(x+y)/2+(x-y)/3=63(x+y)+2(x-y)=36(1)4(x+y)-3(x-y)=-20(2)由（1）*3+(2)*2得9(x+y)+6(x-y)+8(x+y)-6(x-y)=36

2x-y-3=3x+2y+1=0,x=5/7,y=-11/7

3x+2y=32x+3y=75x+5y=10x+y=23x-2x+2y-3y=3-7x-y=-4

x-y-3绝对值+(2x+2y+10)的平方=0X-Y-3=0X-Y=32X+2Y+10=0X+Y=-5(x+y)(x-Y)=3X(-5）=-15

X+Y分之X-Y等于3x=-2yX+Y分之2(x-y)减X+Y分之3X+Y=(-x-3y)/(x+y)=1

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

3x+4y=x+2y+62x-x+4y-2y=62x+2y=6x+y=6/2x+y=3

第二个方程是不是写错了2/（x+y）+3/（x-y）=6是这样吗

3x-5y=0,则x+y/x=（8/5）,x-y/y=（2/3）,2x-3y/2x+3y=(1/19)因为3x-5y=0所以3x=5y设x=5,y=3,可以解得3x-5y=0,则x+y/x=（8/5）

解(x-y)(x+y)-(x-2y)²+x(3x-5y)-(x-y)(x-2y)=(x²-y²)-(x²-4xy+4y²)+(3x²-5xy

若(x-y)/(x+y)=3那么x-y=3(x+y)x-y=3x+3y故x=-2y所以(x+2y)/(6x-7y)=(-2y+2y)/(6*(-2y)-7y)=0如果不懂,请Hi我,祝学习愉快!

2(3x-2y)-(x-y)+(-x+9y)=展开得4x+6y=2（2x+3y）=2004*2=4008

3x+2y=a,2x+3y=b两式相加可得5x+5y=a+b∴x+y=(a+b)/5两式相减可得x-y=a-b所以(x+y)(x-y)=(a+b)/5*(a-b)=(a²-b²)/

y′=y/x+tan[(y/x)^2]

设一个变量u=y/x,带入方程很好求解,解不出来再联系我哈

很累-3x-2y

2(3x-2y)-(x-y)+(-x+9y)=6x-4y-x+y-x+9y=4x+6y题目是错的,请核对题目.再问：昂。。。真的错了吖==2x+3y=2012,则代数式2(3x-2y)-(x-y)+(