x+{40-[42-(18-x)]}怎么算
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![x+{40-[42-(18-x)]}怎么算](/uploads/image/z/248658-42-8.jpg?t=x%2B%7B40-%5B42-%2818-x%29%5D%7D%E6%80%8E%E4%B9%88%E7%AE%97)
x+{40-[42-(18-x)]}怎么算
x+{40-[42-(18-x)]}怎么算
x+{40-[42-(18-x)]}怎么算
=x+40-[42-(18-x)]
=x+40-42+(18-x)
=x-2+18-x
=16
x+{40-[42-(18-x)]}
=x+40-42+18-x
=16
计算 顺序是小括号-中括号-大括号
x+{40-[42-(18-x)]}
=x+{40-[42-18+x)]}
=x+{40-[24+x)]}
=x+{40-24-x)]}
=x+{16-x)]}
=x+16-x
=16
x+{40-[42-(18-x)]}
=x+40-42+18-x
=16