6y-y等于多少
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x²-y²=6y=-x+3代入x²-(-x+3)²=6x²-x²+6x-9=66x=15所以x=5/2y=-x+3=1/2
约掉y结果32.4再问:看补充问题再答:y不存在无解
7x+8y=38010x+6y=380x=20y=30再问:���������再答:7x+8y=380------(1)10x+6y=380-------(2)(2)*4-(1)*3�ã�40x-21
题在哪
x=2y+3(1)3x+y=6(2)把(1)式代入(2)得:3(2y+3)+y=66y+9+y=67y=-3y=-3/7把y=-3/7代入(1)式得:x=15/7综上:x=15/7y=-3/7
…………(X+Y)(X-Y)=X平方-Y的平方x的平方-y的平方=30平方差公式
x^2-y^2=(x-y)(x+y)=5×6=30
(x-y)³(x-y)²(y-x)=-(x-y)³(x-y)²(x-y)=-(x-y)³+2+1=-(x-y)^6
8y-9y=-y
y=19.8-15.84=3.96x=y除以19.8=0.2
x^2+2x+y^2-6y+10=x^2+2x+1+y^2-6y+9=(x+1)^2+(y-3)^2
1/3y-2/3y+2y=(1-2+6)/3y=5/3y
y/3-2y/3+2y=-y/3+2y=5y/3
6y2(这个2是指平方)5a+2
(5y+1)÷6=(9y+1)÷8-(1-y)÷3[(5y+1)÷6]×24=[(9y+1)÷8-(1-y)÷3]×244×(5y+1)=3×(9y+1)-8×(1-y)20y+4=27y+3-8+8
稍等,z应该是x吧再答:再问:是的再问:谢谢你!
|x|+y=12,x+|y|=6x>=0时,x+y=12x+|y|=6,|y|-y=-6,无解x
(3y+5)/(3y-6)=1/2+(5y-4)/(2y-4)(3y+5)/(3y-6)-(5y-4)/(2y-4)=1/2(3y+5)/{3(y-2)}-(5y-4)/{2(y-2)}=1/2{2(
两式相加,得5x+5y=90因此3x+3y=54又3x+2y=44,y=102x+3y=46x=8