如题所述
12024124011710520
12020-72-401170-152-20
1 2 0 20 1 1 70 -7 2 -40 -15 2 -20 x-1
1 2 0 20 1 1 70 0 9 450 0 17 85
1 2 0 20 1 1 70 0 9 450 0 0 0 x-1
1x1x9x0x(-1)=0
好了,你哪个大学的啊?
额,不理我,白给你写了,😧