27+(125-58)×42简便运算

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27+(125-58)×42简便运算

27+(125-58)×42简便运算
27+(125-58)×42简便运算

27+(125-58)×42简便运算
27+(125-58)*42
=27+67*42
=3(9+67*14)
=3(9+938)
=3*947
=2841

27+(125-58)*42
=27+125*8-58*5.25
=27+1000+304.5
=1331.5

27+(125-58)*42=27+(100+25-25-33)*42=27+(100-33)*42=27+100*42-33*42
=27+100*42-(60-27)*42=27+100*42-60*42+27*42=27*43+40*42=27*43+40*(43-1)
=27*43+40*43-40=67*43-43+3=66*43+3=2841

27+(125-58)*42
=27+67*42
=3(9+67*14)
=3(9+938)
=3*947
=2841