15x-2x(10-7x) =? (麻煩列式)?

2016-09-09 10:56 am

回答 (6)

2016-10-01 7:53 am

hbhzvbznzbbzhbzhbvvsv

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2016-10-13 12:58 am

15x-2x(10-7x)
=15x-20x-14x^2
=-5x-14x^2

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2016-09-18 11:27 pm

15x-2x(10-7x)
=15x-20x+14x ∧2
=(14x∧2)-5x
=x(14x-5)

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2016-09-14 3:51 pm

15x-2x(10-7x)
=15x-20x+14x ∧2
=(14x∧2)-5x
=x(14x-5)

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2016-09-11 11:31 am

15x-20x+14x(x)
=14x^2-5x

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2016-09-11 2:33 am

15x-2x(10-7x)
=15x-(2x)(10)-2x(-7x)
=15x-2(10)x-(-1)(2)(7)(x)(x)
=15x-20x+14x^2
=14x^2 +(15x-20x)
=14x^2 +(15-20)x
=14x^2 +(-5)x
=14x^2 -5x

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