21x⁴y³-( )+7x²y²÷﹙-7x²y)= ( )+5xy-y

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21x⁴y³-()+7x²y²÷﹙-7x²y)=()+5xy-y21x⁴y³-()+7x²y²÷﹙-7x&

21x⁴y³-( )+7x²y²÷﹙-7x²y)= ( )+5xy-y
21x⁴y³-( )+7x²y²÷﹙-7x²y)= ( )+5xy-y

21x⁴y³-( )+7x²y²÷﹙-7x²y)= ( )+5xy-y
21x⁴y³-( )+7x²y²÷﹙-7x²y)= 21x⁴y³-( )-y
所以括号里的是21x⁴y³-5xy