(2+4/10)*10 :(2+0.4)乘10
1: 10 × (2 + 4 ÷ 10)2: 10 × (2 + (4 ÷ 10))3: 10 × (4 ÷ 10 + 2)4: 10 × ((4 ÷ 10) + 2)5: (2 + 4 ÷ 10) × 106: (2 + (4 ÷ 10)) × 107: (4 ÷ 10 + 2) × 108: ((4 ÷ 10) + 2) × 10
根号下(4^2)+10+10
算不出来