3X-2y=9,x-y=7.2X-3y=10.3x-2y=20.4x-y=14,3x+y=7.2\1x-2y=7,2\1-3y=-8.2m+7n=5,3M+n=-2.2u-5v=12,4u+3v=-2.
问题描述:
3X-2y=9,x-y=7.2X-3y=10.3x-2y=20.4x-y=14,3x+y=7.2\1x-2y=7,2\1-3y=-8.2m+7n=5,3M+n=-2.2u-5v=12,4u+3v=-2.
答