4.4x+6y=54 9x+2y=87 5.2x+y=7 2x+5y=19 6.x+2

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4.4x+6y=54 9x+2y=87 5.2x+y=7 2x+5y=19 6.x+2
4.4x+6y=54
9x+2y=87
5.2x+y=7
2x+5y=19
6.x+2y=21
3x+5y=56

x=50,y=98
再问：哪题
再答： 1) 66x+17y=3967
25x+y=1200
答案：x=48 y=47
(2) 18x+23y=2303
74x-y=1998
答案：x=27 y=79
(3) 44x+90y=7796
44x+y=3476
答案：x=79 y=48
(4) 76x-66y=4082
30x-y=2940
答案：x=98 y=51
(5) 67x+54y=8546
71x-y=5680
答案：x=80 y=59
(6) 42x-95y=-1410
21x-y=1575
答案：x=75 y=48
(7) 47x-40y=853
34x-y=2006
答案：x=59 y=48
(8) 19x-32y=-1786
75x+y=4950
答案：x=66 y=95
(9) 97x+24y=7202
58x-y=2900
答案：x=50 y=98
再答：我全部做完了
再问：太赞了

已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 解方程组(x+y)(x-2y)=-5 (x-y)(x+2y)=7 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 [x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013 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 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= 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 已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y 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