化简 1/(5a-5)*(a^2+2a-63)/(a+9)

解答

化简

\frac{1}{5 a - 5} \cdot \frac{a ^{2} + 2 a - 63}{a + 9}

\frac{a - 7}{5 a - 5}

求解步骤

\frac{1}{5 a - 5} \cdot \frac{a ^{2} + 2 a - 63}{a + 9}

消掉

\frac{a ^{2} + 2 a - 63}{a + 9} : a - 7

= \frac{1}{5 a - 5} (a - 7)

使用分式法则:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{1 \cdot ( a - 7 )}{5 a - 5}

使用法则:

1 \cdot a = a

1 \cdot (a - 7) = (a - 7)

= \frac{a - 7}{5 a - 5}

s im pl i f y 29

f a c t or z^{2} - (1 + w)^{2}

y^{2} + 7 y + 10 = 0

f a c t or 6 p^{2} - 24 p + 24

∣ 2 x - 4 ∣ = 6