1.{x=y-3 {2x+y=13 2.{x+y=11 {3x-2y=8
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1.{x=y-3 {2x+y=13 2.{x+y=11 {3x-2y=8
3.{8x+5y=10 {3x-5y=12
4.{3x+2y=20 {4x-5y=19
3.{8x+5y=10 {3x-5y=12
4.{3x+2y=20 {4x-5y=19
x=10/3,y=19/3
x=6,y=5
x=2,y=-6/5
x=6,y=1
x=6,y=5
x=2,y=-6/5
x=6,y=1
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3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
{x=y-3 {x+y=11 {2x+y=13 {3x-2y=8
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
数学题……555{(3x+y)(3x-y)-(x-5y)(5x-y)-(x-2y)²÷(-4x),x=-2.y
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5