x+{40-[42-(18-x)]}怎么算

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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

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