(1) =(2010+1)× +(1005﹣1)× =2010× + +1005× ﹣ =2009+ +1004﹣ =3013+ =3013 |
(2)( x﹣9)× =x﹣9 解: x﹣9=5x﹣45 x=5x﹣36 4 x﹣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﹣ + ﹣ + ﹣ +… ﹣ ) = × = |