{7x+15y=1,15x+7y=-23

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{7x+15y=1,15x+7y=-23
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{7x+15y=1,15x+7y=-23
{7x+15y=1,15x+7y=-23

{7x+15y=1,15x+7y=-23

7x+15y=1 两边同乘15得 105x+225y=15
15x+7y=-23 两边同乘7得 105x+49y=-161
两式相减的 176y=176 解得 y=1,x=-2

x=-2,y=1

x^2+y^2=15,x+y=7,x>y,求x-y x1:4x-3y=8;y=7-5x;2:2x-7y=8,3x-8y-10=0;3:4x-y=-1;4:5x-10y+15=0;5:2x-4y=6,3x+2y=27;6:3y=x+5,2x+5y=231:2x+3y=7,3x-5y=1;2:3x+5y=5,3x-4y=23;3:3x+5y=5,3x-4y=23;4:5x+y=7,3x-y=1;5:4x-3y=5,4x+6y=14;6:6x+7y=5,6x-7y=19;7:0.5x-3y=-1,-二分之一x+5y=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 {6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1 x+2y=2x+y+1=7x-y 求:2x-y? 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 用适当的方程解方程组2(x+y)-(x-y)=8 (x+y)-2(x-y)=15 2x+1=5(y+2) (3x+2)-2(y+7x)=16 11x-15y=18,2x+3y=9.(x+1)/3=(5x-y)/5,7y=5x+25 {7x+15y=1,15x+7y=-23 已知:2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x) 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 7x:4y,x:y=( ):( (1)X+Y=15,Y+Z=-6,Z+X=7.(2)X+Y=-14,Y+Z=-7,Z+X=9.(3)X+Y=0,Y+Z=-1,Z+X=-1. 5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3.5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(x-y),其中,x-y=1/3先化简,再求值; 1、3x-2y+20=0,2x+15y-3=0 2、2y-8=-x,4x+3y=7 接下列方程 y=3x-1 2x-y=5 2x+y=8 7x-3y=15 数学二元一次方程要过程1、 2分之x+y+3分之x-y=6 2、3x+2y=7 3、3x+2y+19=7 4(x+y)-5(3x+2y)-3 15x-2y=2(3x+2y)-3 5x-6y+29=2 1、 2分之x+y+3分之x-y=6 2、3x+2y=7 3、3x+2y+19=7 4(x+y)-5(3x+2y)-3 15x-2y=2(3x+2y)-3 5x-6y+29=2