(1) =(2010+1)×+(1005﹣1)× =2010×++1005×﹣ =2009++1004﹣ =3013+ =3013 |
(2)(x﹣9)×=x﹣9 解:x﹣9=5x﹣45 x=5x﹣36 4x﹣36=0 x=36 x=8 |
(3) =1﹣+1﹣+1﹣+1﹣+…+1﹣ =1+1+…+1﹣(++++…+) =10﹣(1﹣+﹣+﹣+…+﹣) =10﹣(1﹣) =9 |
(4) =+ =+ =1+ =1 |
(5) =2009÷+2009+ =2009×+2009+ =++2009 =1+2009 =2010 |
(6) =×(+++…+) =×(1﹣+﹣+﹣+…﹣) =× = |