请解答方程组:(39)2x+y=5 (40)x+y=7 (41)2x+3y=12 (42)2x+y=3ax+3y=7 2
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请解答方程组:
(39)2x+y=5 (40)x+y=7 (41)2x+3y=12 (42)2x+y=3
ax+3y=7 2x-y=8 3x+4y=17 3x-5y=11
(43)3x+y=82 (44)3(x-1)=y+5 45 x/4+y/3=7 (46)x+y/3 +x-y/2=6
10x-11y=87 5(y-1)=3(x+5) 2/3x+y/2=14 3(x+y-)2(x-y)=28
(39)2x+y=5 (40)x+y=7 (41)2x+3y=12 (42)2x+y=3
ax+3y=7 2x-y=8 3x+4y=17 3x-5y=11
(43)3x+y=82 (44)3(x-1)=y+5 45 x/4+y/3=7 (46)x+y/3 +x-y/2=6
10x-11y=87 5(y-1)=3(x+5) 2/3x+y/2=14 3(x+y-)2(x-y)=28
39.
x=8/(6-a)
y=5-(16/(6-a))
40.
x=5
y=2
41.
x=3
y=2
42.
x=2
y=1
43.
x=23
y=13
44.
x=23/6
y=4.5
45.
x=12
y=12
46.
x=104/23
y=108/23
x=8/(6-a)
y=5-(16/(6-a))
40.
x=5
y=2
41.
x=3
y=2
42.
x=2
y=1
43.
x=23
y=13
44.
x=23/6
y=4.5
45.
x=12
y=12
46.
x=104/23
y=108/23
请解答方程组:(39)2x+y=5 (40)x+y=7 (41)2x+3y=12 (42)2x+y=3ax+3y=7 2
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