(21x⁴y³-( )+7x²y²)÷﹙-7x²y)= ( )+5xy-y亲给我完整步骤哦,先谢啦..

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(21x⁴y³-()+7x²y²)÷﹙-7x²y)=()+5xy-y亲给我完整步骤哦,先谢啦..(21x⁴y³-()+7x&#

(21x⁴y³-( )+7x²y²)÷﹙-7x²y)= ( )+5xy-y亲给我完整步骤哦,先谢啦..
(21x⁴y³-( )+7x²y²)÷﹙-7x²y)= ( )+5xy-y
亲给我完整步骤哦,先谢啦..

(21x⁴y³-( )+7x²y²)÷﹙-7x²y)= ( )+5xy-y亲给我完整步骤哦,先谢啦..
(21x⁴y³-( 35x^3y^2)+7x²y²)÷﹙-7x²y)= (-3x^2y^2)+5xy-y
21x^4y^3/(-7x^2y)=-3x^2y^2
-7x^2y*5xy=-35x^3y^2