1、3x+2y=5 6x-5y=1 用带入消元法怎么写?[注意题格式也要写] 2、5x+2y=15 8x+3y=233、7x-3y=-1 4x-5y=-174、10x+3y=1=0 4x+5y+8=0

{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) x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x {(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=? 解二元一次方程5x+y=7,3x-y=1最好带步骤 {x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 x+y/2+x-y/3=5/6;x=y/6-x-y/3=1/2 求Z=2x+y的最大值,使xy满足约束条件,y≤x,x+y≤1,y≥-11.求Z=2x+y的最大值,使x y满足约束条件,y≤x,x+y≤1,y≥-1 2.求Z=3x+5y的最大值最小值,使XY满足条件 5x+3y≤15,y≤x+1,x-5y≤3求详解,带图最好. 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 {y-2x=1,x+2y=2｛x+y=3,2x-3y=6 图像法解方程带图 (x+y)/2+(x-y)/3=6 4(x+y)-2=5(x-y) 解二元一次方程组带过程 3x+2y/4=2x+y/5=x-y+1/6 1、(-y^3)^5/y^3/ y^2+2(-y)^102、(x-y)^7/(y-x)^6+(x+y)^3/(x+y)^23、已知X^a=5,x^b=3,求X^(3a-2b)的值 x+y=3 x+2y=9 3/x+1=y y-x=3 y=2x-3 y-3x=1 2(x+1)-y=6 7x-5y=-9用代入法解 x+y=3 x+2y=9 3/x+1=y y-x=3 y-x=3 y=2x-3 y-3x=1 2(x+1)-y=6 7x-5y=-9 y-x=3 用代入法解下列方程组 1）.x=3y,x+4y=14 2).x-3=2y,2x+1=3y 3).3x-5y=6,x+4y=-154).2x-y=5,3x+4y=2 5).3x+1=4y-x=y+2 （2x+y-1)(2x-y+1)-(3x+y)(3x-y),其中x=5分之1, (x+2y)(x-2y)-(2x-y)的平方+(3x-y)(2x-5y)其中x=-1 y=13分之1