{x/4+y/3=4/3,5(x-9)=6(y-2)(二元一次方程)
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{x/4+y/3=4/3,5(x-9)=6(y-2)(二元一次方程){x/4+y/3=4/3,5(x-9)=6(y-2)(二元一次方程){x/4+y/3=4/3,5(x-9)=6(y-2)(二元一次方
{x/4+y/3=4/3,5(x-9)=6(y-2)(二元一次方程)
{x/4+y/3=4/3,5(x-9)=6(y-2)(二元一次方程)
{x/4+y/3=4/3,5(x-9)=6(y-2)(二元一次方程)
1)x/4+y/3=4/3 通分 整理后(3)3x+4y=16(两边×5得(5)15x+20y=80
(2)5(x-9)=6(y-2)整理后得(4)5x-6y=33 两边同时×3得(6)15x-18y=99
(5)和(6)相减
38y=-19
y=-1/2 代入到(3)
3x=16-4y=16+2=18
x=6
x=6,y=-0.5
4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
(5x+3y)(3y-5x)-(4x-y)(4y+x)=
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2
先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5
(x-y)/4+(x+y)/5=1/4 (x+y)/9-(x-y)/3=//2(x-y)/4+(x+y)/5=1/4(x+y)/9-(x-y)/3=//2
接二元一次4(x+y)-3(x-y)=9;5(x-y)+2(x+y)=11
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
x+y=5 2x+3y-z=9 x-y+z=4
9y=3x-(x-1),4(x+y)-(2x+4)=8y
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
3X=5Y (X+Y)*3X=(2Y+X)*4+2*2
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
xy²/(x²y-y) × x²/(x²+x)=(x²-3x)/(x²-5x) × 2x-10/(x²-6x+9)=化简求植x²-1/(x²-x-2)除以x/2x-4,其中x=1/2[x-x/(x+1)]除以[x/(2x-4)] ,其中x=√2+1
3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y 联立方程 有的话
3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y
3x+2=y 5X+4=Y 7X+6=Y 9X+8=y 11x=y要如何计算