若X与x 2互为相反数,则x=
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∵|x-3|与|2y+3|互为相反数,∴|x-3|+|2y+3|=0,∴x-3=0,2y+3=0,解得x=3,y=-32,所以,x+y=3+(-32)=32.故答案为:32.
∵x2+4x-5与2-2x是互为相反数,∴x2+4x-5+2-2x=0,∴x2+2x-3=0,∴(x-1)(x+3)=0,解得x=-3或x=1.故答案为-3或1.
∵代数式x2-x-2与2x-1的值互为相反数,∴x2-x-2+2x-1=0,∴x2+x-3=0,b2-4ac=1-4×1×(-3)=13>0,∴x=-b±b2-4ac2a=-1±132×1,∴x1=-
x+2+x-3=02X=1X=0.5
∵4x-5与3x-9互为相反数∴4x-5=-(3x-9)=>4x-5=-3x+9=>7x=4=>x=4/7
1.由题知5x-7+4x-9=0解得,x=16/92.设甲每小时加工的零件个数为x,由题意得[x+(x-4)]*5=280解得,X=303.18+x/3+x+1=234x/3=4x=3你那4X-3是分
3x+2+(-2x+1)=0x=-3
X=+1=-8,X=-9;3X-1=8,X=3
x-1=-(2-3x)x-1=-2+3x3x-x=2-12x=1x=1/2
2X-1=-(3x-5)x=1.2
∵代数式-3x+1与4x-5互为相反数,则有:-3x+1+4x-5=0,解得:x=4.
x^2+y^2=(x-y)^2+2xy而xy=[(x+y)^2-(x-y)^2]/4=-25/4所以原式=25-25/2=25/2或者根据x+y=0,直接求出x,y这样更简单
4x+8=-(3x-10)7x=2x=2/7
x/2-1+x=-(x+2)x/2-1+x-x-2=0x/2-3=0x/2=3x=6
∵x2-4x+4与|y-1|互为相反数,∴x2-4x+4+|y-1|=0.∴(x-2)2+|y-1|=0.∴(x-2)2=0,|y-1|=0.∴x=2,y=1.∴(xy−yx)÷(x+y)=(2-12
3(x-1)+(x-2)=03x-3+x-2=04x-5=04x=5x=5/4
3-2X/4=-(3X-2/5)=2-3x/5-->10x-15=12x-8-->x=-7/2
5x+2与4-7x互为相反数5x+2+4-7x=0x=3
若x+2/3与x/4互为相反数,则x+2/3=-x/4两边乘以12,得4(x+2)=-3x4x+3x=-8所以x=-8/7