[(xy-2)2次方-(-xy-1)(xy-4)]除(-3分之1xy)

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[(xy-2)2次方-(-xy-1)(xy-4)]除(-3分之1xy)[(xy-2)2次方-(-xy-1)(xy-4)]除(-3分之1xy)[(xy-2)2次方-(-xy-1)(xy-4)]除(-3分

[(xy-2)2次方-(-xy-1)(xy-4)]除(-3分之1xy)
[(xy-2)2次方-(-xy-1)(xy-4)]除(-3分之1xy)

[(xy-2)2次方-(-xy-1)(xy-4)]除(-3分之1xy)

[(xy-2)2次方-(-xy-1)(xy-4)]除(-3分之1xy)
=(x²y²-4xy+4+x²y²-3xy-4)÷(-3分之1xy)
=(2x²y²-7xy)÷(-3分之1xy)
=-6xy+21