3a^2-{5a(4a-1)-7a^2}
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3a^2-{5a(4a-1)-7a^2}
![3a^2-{5a(4a-1)-7a^2}](/uploads/image/z/18428862-30-2.jpg?t=3a%5E2-%7B5a%284a-1%29-7a%5E2%7D)
3a^2-{5a(4a-1)-7a^2}
=3a^2-(20a^2-5a-7a^2)
=3a^2-(13a^2-5a)
=-10a^2+5a
再问: 3a^2-{5a-(4a-1)-7a^2}
再答: 3a^2-{5a-(4a-1)-7a^2} =3a^2-(5a-4a+1-7a^2) =3a^2-(a+1-7a^2) =3a^2-a-1+7a^2 =10a^2-a-1
=3a^2-(20a^2-5a-7a^2)
=3a^2-(13a^2-5a)
=-10a^2+5a
再问: 3a^2-{5a-(4a-1)-7a^2}
再答: 3a^2-{5a-(4a-1)-7a^2} =3a^2-(5a-4a+1-7a^2) =3a^2-(a+1-7a^2) =3a^2-a-1+7a^2 =10a^2-a-1
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