what must you do to make the equation below true?81乘9等于801?

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what must you do to make the equation below true?81乘9等于801?

what must you do to make the equation below true?81乘9等于801?
what must you do to make the equation below true?81乘9等于801?

what must you do to make the equation below true?81乘9等于801?
用什么方式使一下等式成立,81乘9等于801

81*10-9=801

89乘9等于801

89*9+72=801