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展开全部
267+(155-67)
=267-67+155
=200+155
=355
102×19-38
=102×19-2×19
=(102-2)×19
=100×19
=1900
=267-67+155
=200+155
=355
102×19-38
=102×19-2×19
=(102-2)×19
=100×19
=1900
追问
42×41+59×42
=
=
=
追答
42×41+59×42
=42*[41+59
=42*100
=4200?
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