问题
填空题
计算:8-9+10-11+26-41+42=______.
答案
8-9+10-11+26-41+42,
=(42-41)+(26-11)+(10-9)+8,
=1+15+1+8,
=25;
故答案为:25.
计算:8-9+10-11+26-41+42=______.
8-9+10-11+26-41+42,
=(42-41)+(26-11)+(10-9)+8,
=1+15+1+8,
=25;
故答案为:25.