1.(3a^2-5a+6)-3(-2a^2-2a+4)2.3a^2b-2[ab^2-2(a^2b-2ab^2)]3.3a^2-[7b-(4a-b)-2a^2]4.-7x^2+(6x^2-5xy)-2(3y^2+xy-x^2)^2是的平方 不要错误答案

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1.(3a^2-5a+6)-3(-2a^2-2a+4)2.3a^2b-2[ab^2-2(a^2b-2ab^2)]3.3a^2-[7b-(4a-b)-2a^2]4.-7x^2+(6x^2-5xy)-2(

1.(3a^2-5a+6)-3(-2a^2-2a+4)2.3a^2b-2[ab^2-2(a^2b-2ab^2)]3.3a^2-[7b-(4a-b)-2a^2]4.-7x^2+(6x^2-5xy)-2(3y^2+xy-x^2)^2是的平方 不要错误答案
1.(3a^2-5a+6)-3(-2a^2-2a+4)
2.3a^2b-2[ab^2-2(a^2b-2ab^2)]
3.3a^2-[7b-(4a-b)-2a^2]
4.-7x^2+(6x^2-5xy)-2(3y^2+xy-x^2)
^2是的平方 不要错误答案

1.(3a^2-5a+6)-3(-2a^2-2a+4)2.3a^2b-2[ab^2-2(a^2b-2ab^2)]3.3a^2-[7b-(4a-b)-2a^2]4.-7x^2+(6x^2-5xy)-2(3y^2+xy-x^2)^2是的平方 不要错误答案
(1)(3a²-5a+6)-3(-2a²-2a+4)
=3a²-5a+6+6a²+6a-12
=9a²+a-6
(2)3a²b-[ab²-2(a²b-2ab²)]
=3a²b-[ab²-2a²b+4ab²]
=3a²b-[5ab²-2a²b]
=3a²b-5ab²+2a²b
=5a²b-5ab²
(3)3a²-[7b-(4a-b)-2a²]
=3a²-[7b-4a+b-2a²]
=3a²-[8b-4a-2a²]
=3a²-8b+4a+2a²
=5a²+4a-8b
(4)-7x²+(6x²-5xy)-2(3y²+xy-x²)
=-7x²+6x²-5xy-6y²-2xy+2x²
=x²-7xy-6y²