99✖️7+77✖️9+33✖️18这题简便方法怎么算?
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2020-04-20
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99✖️7+77✖️9+33✖️18
=(90+9)X7+77X9+33X2X9
=90X7+9X7+77X9+66X9
=90X7+(7+77+66)X9
=9X70+150X9
=(70+150)X9
=220X9
=1980
=(90+9)X7+77X9+33X2X9
=90X7+9X7+77X9+66X9
=90X7+(7+77+66)X9
=9X70+150X9
=(70+150)X9
=220X9
=1980
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