y 4y*y=6咋解
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移项、得1.5y=-3系数化为一、y=-2很简单的呀
设x-y=mx+y=n则6m-2n=143m+n=5解得m=2n=-1即x-y=2x+y=-1解得x=1/2y=-3/2
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
{(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
6y+12/y^2+4y+4-y^2-4/y^2-4y+4+y^2/y^2-4=0没有说明分母是那个分子是那个这样子很混乱建议加括号扩住分子分母再问:我现在加了括号再答:解6(Y+2)/(Y+2)^2
80-10y+6y=5680-56=10y-6y24=4yy=6
第二个方程是不是写错了2/(x+y)+3/(x-y)=6是这样吗
(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y=(x+y)(x-y)-y^2+(x-y)^2-2y(3x^2-xy)÷2y=(x+y)(x-y)-y^2+(x-y)^2
(y+4)/5+y+6=(y+8)/2-(y+4)/3乘以30得6(y+4)+30y+180=15(y+8)-10(y+4)6y+24+30y+180=15y+120-10y-406y+30y-15y
设4x^2=a,4y^2=b,4z^2=b,则有x=二分之一根号a,y=二分之一根号b,z=二分之一根号c,将abc代入式子中得:
6y-(y+2分之y+2-y分之y)除以y³-4y-2y²+8分之y=6y-[(2y-y²+2y+y²)/(4-y²)]÷y/(y-2)³=
题意不清什么是平方,*吗?那么**代表三次方还是4次方呢
3(x+y)-4(x-y)=4(x+y)/2+(x-y)/6=1令a=x+y,b=x-y3a-4b=4(1)a/2+b/6=1则3a+b=6(2)(2)-(1)5b=2b=2/5a=(6-b)/3=2
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!
第一个式子左边右边同时乘以3得:X+Y+3Y=18即X+4Y=18第二个式子3X+2Y=24解得:X=6,Y=3
2.5y+10y-6y=15-21.56.5y=-6.5y=-6.5÷6.5y=-1
数学之美团为你解答3x/(x-4y)+(x+y)/(4y-x)-7x/(x-4y)=3x/(x-4y)-(x+y)/(x-4y)-7x/(x-4y)=(3x-x-y-7x)/(x-4y)=(-5x-y
题目有误(1)若是(3y+5)/(3y-6)=1/2+(5y-4)/(2y-4),(3y+5)/(3y-6)=1/2+(5y-4)/(2y-4)两边同时乘以12(y-2),得(3y+5)x4=12(y
完整设1/(x+y)=a,1/(x-y)=b原方程组可变为4a+6b=39b-a=1a=9b-136b-4+6b=3b=1/6,a=1/2x+y=2x-y=6所以原方程组的解为:x=4,y=-2