展开 (*+y)(3+z)

解答

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(\cdot + y) (3 + z)

3 y + yz

求解步骤

(y) (3 + z)

使用分配律:

a (b + c) = ab + a c

a = (y), b = 3, c = z

= (y) \cdot 3 + (y) z

= 3 (y) + (y) z

去除括号:

(a) = a

= 3 y + yz

e x p an d \frac{2 x}{( x - 1 ) ( x - 2 ) ( x - 3 )}

e x p an d - \frac{4 ( 7 - 3 2 )}{31}

e x p an d \frac{k}{s ^{2} ( s + 1 )}

e x p an d 2 (2^{2}) - 3 (- 1) + (- 2)

e x p an d - \frac{1}{2 ( x + 2 )}