在下面算式中加上小括号或中括号,使等式成立.(1)240 ÷ 18 + 6 × 2 = 5(2)240 ÷ 18 + 6 × 2 = 8(3)280 ÷ 9 + 5 × 5 = 100(4)280 ÷ 9 + 5 × 5 = 4

问题描述:

在下面算式中加上小括号或中括号,使等式成立.
(1)240 ÷ 18 + 6 × 2 = 5
(2)240 ÷ 18 + 6 × 2 = 8
(3)280 ÷ 9 + 5 × 5 = 100
(4)280 ÷ 9 + 5 × 5 = 4

(1)240 ÷ [(18 + 6 )× 2] = 5
(2)240 ÷ (18 + 6 × 2 )= 8
(3)280 ÷( 9 + 5 )× 5 = 100
(4)280 ÷ [(9 + 5 )× 5] = 4