newboys wrote:6÷2(1+2)2(...(恕刪) 6÷2(1+2)2(1+2)要先算=66÷6=1錯2(1+2)要先算的話式子要改成有中括號6÷[3(2+1)]6÷6=1答案才是 16÷2(1+2)基本上算式看起來怪怪的要 6÷2x(1+2) 才正常