化简 (4b+10c)(10c-4b)+(-5c+2b)(5c+2b)

解答

化简

(4 b + 10 c) (10 c - 4 b) + (- 5 c + 2 b) (5 c + 2 b)

75 c^{2} - 12 b^{2}

求解步骤

(4 b + 10 c) (10 c - 4 b) + (- 5 c + 2 b) (5 c + 2 b)

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(4 b + 10 c) (10 c - 4 b) : 100 c^{2} - 16 b^{2}

= 100 c^{2} - 16 b^{2} + (- 5 c + 2 b) (5 c + 2 b)

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(- 5 c + 2 b) (5 c + 2 b) : 4 b^{2} - 25 c^{2}

= 100 c^{2} - 16 b^{2} + 4 b^{2} - 25 c^{2}

s im pl i f y 227

s im pl i f y 4 (\frac{3}{2})^{- 1}

s im pl i f y a + b - c - b - c + 2 c - a

f a c t or f (lo g_{10} (4 - x^{2}))

\frac{3}{10} \geq k - \frac{3}{5}