化简 ((x+7)/x+3x)10

解答

化简

(\frac{x + 7}{x} + 3 x) 10

\frac{10 ( 3 x ^{2} + x + 7 )}{x}

求解步骤

(\frac{x + 7}{x} + 3 x) \cdot 10

合并

\frac{x + 7}{x} + 3 x : \frac{3 x ^{2} + x + 7}{x}

= \frac{3 x ^{2} + x + 7}{x} \cdot 10

使用分式法则:

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

= \frac{( 3 x ^{2} + x + 7 ) \cdot 10}{x}

= \frac{10 ( 3 x ^{2} + x + 7 )}{x}

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e x p an d A (- 13, - 15) y B (5, - 19)

e x p an d (1 - 32) (3 + 52)

e x p an d (y^{2} - x^{2}) y^{2} - x^{2}

e x p an d cos (2 \cdot π \cdot f \cdot t) (A \cdot m \cdot cos (2 \cdot π \cdot f \cdot t) + α w)