作业帮1）.(4x^3-6x^2)÷2x^2（2）.（12m^2n+20mn）÷4mn（3）.（9x^4-12x^3+54x^2）÷3x^2（4）.(-14x^3y-21x^2y^2+63xy^3)÷（-7xy）谢谢了!
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1）.(4x^3-6x^2)÷2x^2（2）.（12m^2n+20mn）÷4mn（3）.（9x^4-12x^3+54x^2）÷3x^2（4）.(-14x^3y-21x^2y^2+63xy^3)÷（-7xy）谢谢了!
1）.(4x^3-6x^2)÷2x^2（2）.（12m^2n+20mn）÷4mn（3）.（9x^4-12x^3+54x^2）÷3x^2（4）.(-14x^3y-21x^2y^2+63xy^3)÷（-7xy）谢谢了!
1）.(4x^3-6x^2)÷2x^2（2）.（12m^2n+20mn）÷4mn（3）.（9x^4-12x^3+54x^2）÷3x^2（4）.(-14x^3y-21x^2y^2+63xy^3)÷（-7xy）谢谢了!
1）.(4x^3-6x^2)÷2x^2
=4x^3÷2x^2-6x^2 ÷2x^2
=2x-3
（2）.（12m^2n+20mn）÷4mn
=12m^2n÷4mn+20mn÷4mn
=3m+5
（3）.（9x^4-12x^3+54x^2）÷3x^2
=9x^4÷3x^2-12x^3÷3x^2+54x^2÷3x^2
=3x²-4x+18
（4）.(-14x^3y-21x^2y^2+63xy^3) ÷（-7xy）
=-14x^3y ÷（-7xy）-21x^2y^2 ÷（-7xy）+63xy^3 ÷（-7xy）
=2x²+3xy-9y²
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