展开 binomial(b+n,2)

解答

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bin o mia l (b + n, 2)

iinm l bb o a + iinnm l b o a, 2

求解步骤

bin o mia l (b + n, 2)

= iinm l b o a (b + 2, n)

使用分配律:

a (b + c) = ab + a c

a = bin o mia l, b = b, c = n, 2

= bin o mia l b + bin o mia l n, 2

= iinm l bb o a + iinnm l b o a, 2

e x p an d \frac{2 ( 4.3 + 3.4 j )}{4.3 - 3.4 j}

e x p an d (e^{- 3 t} + e^{3 t})^{3}

e x p an d \frac{3 ( x + 4 )}{( x + 2 ) ^{2}}

e x p an d \frac{n ( n + 2 ) ( n + 3 ) ( n + 4 )}{4}

e x p an d y (- e^{- y} = x^{3} + c)