初一数学基础训练有理数的除法（2）第11.12题怎么做啊11.若a与2b互为负倒数,-c与d/2互为相反数,m与n互为相反数,试求2ab-2c+d+m/n.12.求(1/2001-1)*(1/2001-1)*(1/1999-1)*…*(1/1001-1)*(1/1001-1)的值

Question

初一数学基础训练 有理数的除法（2）第11.12题怎么做啊
11.若a与2b互为负倒数,-c与d/2互为相反数,m与n互为相反数,试求2ab-2c+d+m/n.
12.求(1/2001-1)*(1/2001-1)*(1/1999-1)*…*(1/1001-1)*(1/1001-1)的值

Answer 1

a*2b=2ab=1
c=d/2 所以2c=d
m/n=-1
原式=1-d+d-1
=0