算一算
1-2+3-4+5-6+7-8+9-10+11=
答案:
1-2+3-4+5-6+7-8+9-10+11
=1+3-2+5-4+7-6+9-8+11-10
=1+(3-2)+(5-4)+(7-6)+(9-8)+(11-10)
=1+1+1+1+1+1
=6
算一算
1-2+3-4+5-6+7-8+9-10+11=
答案:
1-2+3-4+5-6+7-8+9-10+11
=1+3-2+5-4+7-6+9-8+11-10
=1+(3-2)+(5-4)+(7-6)+(9-8)+(11-10)
=1+1+1+1+1+1
=6