添上括号使下面的等式成立.240 ÷ 4 + 20 - 2 = 8 90 - 30 ÷ 30 × 5 = 10240 ÷ 40 + 20 × 2 = 52 90 - 30 ÷ 3 × 5 = 400

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添上括号使下面的等式成立.240 ÷ 4 + 20 - 2 = 8 90 - 30 ÷ 30 × 5 = 10240 ÷ 40 + 20 × 2 = 52 90 - 30 ÷ 3 × 5 = 400
添上括号使下面的等式成立.
240 ÷ 4 + 20 - 2 = 8 90 - 30 ÷ 30 × 5 = 10
240 ÷ 40 + 20 × 2 = 52 90 - 30 ÷ 3 × 5 = 400

添上括号使下面的等式成立.240 ÷ 4 + 20 - 2 = 8 90 - 30 ÷ 30 × 5 = 10240 ÷ 40 + 20 × 2 = 52 90 - 30 ÷ 3 × 5 = 400
240 ÷ (4 + 20) - 2 = 8
(90 - 30) ÷ 30 × 5 = 10
(240 ÷ 40 + 20 ) × 2 = 52
(90 - 30 ÷ 3 )× 5 = 400

多动动脑筋,你没问题
240 ÷( 4 + 20) - 2 = 8 ( 90 - 30) ÷ 30 × 5 = 10
(240 ÷ 40 + 20 )× 2 = 52 ( 90 - 30 ÷ 3 ) × 5 = 400

240÷(4+20)-2=8
(90-30)÷30×5=10
(240÷40+20)×2=52
(90-30÷3)×5=400