2x+3y=5(1)7x+6y=10(2)求xy的值
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2x+3y=5(1)7x+6y=10(2)求xy的值2x+3y=5(1)7x+6y=10(2)求xy的值2x+3y=5(1)7x+6y=10(2)求xy的值2x+3y=5(1)7x+6y=10(2)(
2x+3y=5(1)7x+6y=10(2)求xy的值
2x+3y=5(1)7x+6y=10(2)求xy的值
2x+3y=5(1)7x+6y=10(2)求xy的值
2x+3y=5 (1)
7x+6y=10(2)
(2)-2*(1),7x-4x=10-5*2
3x=0
x=0
把x代入(1)得
3y=5
y=5/3
即x=0,y=5/3
xy=0
(1)*2得4x+6y=10(3)
(3)-(2)得x=0
则y=5/3
xy=0
2x+3y=5(1),7x+6y=10(2)
方程(1)乘以6得:12x+18y=30(3)
方程(2)乘以3得:21x+18y=30(4)
方程(2)式-(1)得:X=0
将X=0带入(1)得:18y=30,y=5/3
即xy=0
(1)x2:4X+6Y=10
(2)7X+6Y=10
(2)-(1)
X=0
XY=0
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
已知:2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x)
x-y/7 - x+y/10 =1/2 2(x-y)-5(x+y)=3修改、、、、(x-y)/7-(x+y)/10=1/2 2(x-y)-5(x+y)=3
例X=1 y=21.X+Y=5 X-Y=15 2.2X+3Y=4 5X+6Y=7 3.X+3Y=5 3X+Y=-1 4.2X+Y=3 3X+5Y=11 5.4X+3Y=6 2X+Y=4 6.X+Y=180 X=3Y-10 7.3X-2Y=3 2X-Y=7 8.5X+3Y=7Y X+Y=45 9.3X+4Y=126X+8Y=24 X:6Y=1:4 10.X+Y=138 X-45=Y+53 11.X+Y=60 14Y=20X 12.2X+3Y=15.5 5X+6Y=35 13.X+Y=170 3
{ x-y/7-x+y/10=1/2 {2(x-y)+5(x+y)=3
{ x-y/7-x+y/10=1/2 {2(x-y)+5(x+y)=3
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
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=5① x=3y+2① 9x-5y=1① 3x-2y=11① x-2y=y+1① 2x-y=7② x+3y=8② 6x-7y=2② 2x+3y=16② 2x-3y=10②3x+2y=y+1①2x-3y=10②D
3x+5y-(x+y)=6 2(x+y)-3x=-7
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/6=5 2(x+y)-3(x-y)=-2
6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
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