Question

9 8 7 6 5 4 3 2 1 =1000(填入加减乘除小括号)

Answer 1

(9x8x7-(3+2-1))x4x5=1000(1+9)x(2+8)x(3+7)x(5-4)=1000

Answer 2

987+6+5+4-3+2-1=1000
(9×8×7-6-5+4+3)×2÷1=1000

Answer 3

〔1－2＋3〕×4× 5×〔6×7－8－9〕=1000