展开 A(2, 3/4)B(3/5 ,-1/2)

解答

展开

A (2, \frac{3}{4}) B (\frac{3}{5}, - \frac{1}{2})

\frac{3}{5} (2 \cdot \frac{3}{4},) A B, - \frac{1}{2} (2 \cdot \frac{3}{4},) A B

求解步骤

A (2, \frac{3}{4}) B (\frac{3}{5}, - \frac{1}{2})

= (2 \cdot \frac{3}{4},) (\frac{3}{5}, - \frac{1}{2}) A B

使用分配律:

a (b - c) = ab - a c

a = A (2, \frac{3}{4}) B, b = \frac{3}{5},, c = \frac{1}{2}

= A (2, \frac{3}{4}) B \frac{3}{5}, - A (2, \frac{3}{4}) B \frac{1}{2}

= \frac{3}{5} (2 \cdot \frac{3}{4},) A B, - \frac{1}{2} (2 \cdot \frac{3}{4},) A B

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

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

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

e x p an d lo g_{x} (3 y)

e x p an d (- 3, - 1) y (5, 2)