智力题,一题多变.1.若/m/+/n/=0,则m、n各等于多少?2.若/m-1/+/n-2/=0,则m+n等于多少?3.已知/a-3/+/2b-4/+/1\2c-2/=0,求a+b+c的值.

智力题,一题多变.1.若/m/+/n/=0,则m、n各等于多少?2.若/m-1/+/n-2/=0,则m+n等于多少?3.已知/a-3/+/2b-4/+/1\2c-2/=0,求a+b+c的值.
智力题,一题多变.
1.若/m/+/n/=0,则m、n各等于多少?
2.若/m-1/+/n-2/=0,则m+n等于多少?
3.已知/a-3/+/2b-4/+/1\2c-2/=0,求a+b+c的值.

智力题,一题多变.1.若/m/+/n/=0,则m、n各等于多少?2.若/m-1/+/n-2/=0,则m+n等于多少?3.已知/a-3/+/2b-4/+/1\2c-2/=0,求a+b+c的值.
1：m=n=0;
2:m=1,n=2;则：m+n=3；
3：a=3,b=2,c=4,则a+b+c=9;