问题
解答题
1+3-4-5+6+8-9-10+11=1,请写出式子等于1的简便过程.
原式=______
=______
=______.
答案
1+3-4-5+6+8-9-10+11
=1+(3+6-4-5)+(8+11-9-10)
=1+0+0
=1.
1+3-4-5+6+8-9-10+11=1,请写出式子等于1的简便过程.
原式=______
=______
=______.
1+3-4-5+6+8-9-10+11
=1+(3+6-4-5)+(8+11-9-10)
=1+0+0
=1.