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2(5mn-2m+3n)+(-7m-7mn)4(2ab+3b^2-5)-(3ab+3b^2-8)6-(10x^3+2xy^2+y^3)+(10x^3+3xy^2-8y^3)83(a^3-a^2b+1/2ab^2)-1/2(6a^3+4a^2b+3ab^2)..
题目详情
【2】(5mn-2m+3n)+(-7m-7mn) 【4】(2ab+3b^2 - 5)-(3ab+3b^2 - 8) 【6】-(10x^3+2xy^2+y^3)+(10x^3+3xy^2-8y^3) 【8】3(a^3-a^2b+1/2ab^2)-1/2(6a^3+4a^2b+3ab^2) ..
▼优质解答
答案和解析
【2】(5mn-2m+3n)+(-7m-7mn) =5mn-2m+3n-7m-7mn=(5mn-7mn)+(-2m-7m)+3n=-2mn-9m+3n
【4】(2ab+3b^2 - 5)-(3ab+3b^2 - 8) =(2ab-3ab)+(3b^2+3b^2)-5-8=6b^2-ab-13
【6】-(10x^3+2xy^2+y^3)+(10x^3+3xy^2-8y^3) =-10x^3-2xy^2-y^3+10x^3+3xy^2-8y^3)
=(-10x^3+10x^3)+(-2xy^2+3xy^2）+（-y^3-8y^3）=xy^2-9y^3
【8】3(a^3-a^2b+1/2ab^2)-1/2(6a^3+4a^2b+3ab^2) =3a^3-3a^2b+3/2ab^2-3a^3-2a^2b-3/2ab^2
=-5a^2b
【4】(2ab+3b^2 - 5)-(3ab+3b^2 - 8) =(2ab-3ab)+(3b^2+3b^2)-5-8=6b^2-ab-13
【6】-(10x^3+2xy^2+y^3)+(10x^3+3xy^2-8y^3) =-10x^3-2xy^2-y^3+10x^3+3xy^2-8y^3)
=(-10x^3+10x^3)+(-2xy^2+3xy^2）+（-y^3-8y^3）=xy^2-9y^3
【8】3(a^3-a^2b+1/2ab^2)-1/2(6a^3+4a^2b+3ab^2) =3a^3-3a^2b+3/2ab^2-3a^3-2a^2b-3/2ab^2
=-5a^2b
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