1.4/(x+5)+1/(y-2)=42/(x+5)+1/(2-y)=82.(x+y)/3-3/(x-y)= -1/6(x+y)/2+2/(x-y)=33.1/x+1/y=1/101/y+1/z=1/151/z+1/x=1/124.x/2=y/-3=z/4x/(x+y+z)=2/(4x-5)
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初二上学期方程题 4x+y=5 5x+4y=63x-2y=1 2x+3y=13x-2y=7 7x+5y=32x+3y=17 2x-y=-4x+5y=6 2x+y=23x-6y=4 3x+2y=52x+y=73x-4y=53x+y=1x-2y=-1x+y=42x+3y=92x-3y=74x+5y=3x+y=20004x+6y=90003x+5y=113x-2y=42x+3y=215x-2y=5x+y=54x+3y=182x+3y=16x+4y=132x+3y=40x
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
1:4(x-100)+3y=5 2:6(x-y)-2(x+y )=14 x-100=-y 3(x-y)+(x+y)=5 先无视上面的1.4(x-100)+3y=5x-100=-y2.6(x-y)-2(x+y )=143(x-y)+(x+y)=5
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?
1.4/(x+5)+1/(y-2)=42/(x+5)+1/(2-y)=82.(x+y)/3-3/(x-y)= -1/6(x+y)/2+2/(x-y)=33.1/x+1/y=1/101/y+1/z=1/151/z+1/x=1/124.x/2=y/-3=z/4x/(x+y+z)=2/(4x-5)
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
分式的加减:[(x/y-y/x)除以(x+y)+x(1/y-1/x)]除以1+x/y,其中x=5,y=2
先化简,再求值[(2x+y)^2-(2x+y)(2x-y)-y(5x+y)]÷(1/2y),其中x-y=2
求这几道二元一次方程的解,直接是x,y等于多少就行,1.3x-2y=1 x-y=3 2.x+3y=-5 3x-4y=-2这个是接着上面的.3.y-3x=2x-2y=34.5x+3y=22x-y=35.3x-y=42x+y=66.2x+3y=73x-2y=3
请解答方程组:(39)2x+y=5 (40)x+y=7 (41)2x+3y=12 (42)2x+y=3ax+3y=7 2x-y=8 3x+4y=17 3x-5y=11(43)3x+y=82 (44)3(x-1)=y+5 45 x/4+y/3=7 (46)x+y/3 +x-y/2=610x-11y=87 5(y-1)=3(x+5) 2/3x+y/2=14 3(x+y-)2(x-y)=28
(x+2y)(x-2y)-(2x-y)的平方+(3x-y)(2x-5y)其中x=-1 y=13分之1
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x
解方程组 2x-y=5 2y/x-x/y=12x-y=52y/x-x/y=1
(2x+y-1)(2x-y+1)-(3x+y)(3x-y),其中x=5分之1,
{x/60+y/80=10,x/60+y/40=15、{2x/3+3y/4=1/5,5x/6-5y/2=2、{5/2(x+y)=1200,10/3(x+y)=1200{4x+5y=98,5y-4x=2、{x/3+y/4=54/60,y/4+x/5=42/60怎么解?{40-y=x-4 40-y=y-x
已知|3x-4y|=42,|x-1|小于等于5,|y+2|小于等于4求x+y
已知|3x-4y|=42,|x-1|小于等于5,|y+2|小于等于4求x+y