（3,3,7,10 无解）2,5,9,10 1:2 × 10 - 5 + 92:(2 × 10) - 5 + 93:(2 × 10 - 5) + 94:((2 × 10) - 5) + 95:2 × 10 -(5 - 9)6:(2 × 10) - (5 - 9)7:2 × 10 + 9 - 58:(2 × 10) + 9 - 59:(2 × 10 + 9) - 510:(...