解方程组{ax+5Y=15;4x-by=-2_数学解答

解方程组{ax+5Y=15;4x-by=-2

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解答

4aX+20Y=60
4aX-abY=-2a
20Y+abY=60+2a
Y=(60+2a)/(20+ab)
X=[-2+(60b+2ab)/(20+ab)]/4=-1/2+(30b+ab)/(40+2ab)