電子課本網 › 第72頁

第72頁

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B

$解:原式?=\frac {3+12-5}{a}?$

$? =\frac {10}{a}?$

$解:原式?=\frac {x+y}{x+y}?$

$? =1?$

$解:原式?=\frac {2x+x}{x-y}$

$=\frac{3x}{x-y}$

$解:原式?=\frac {x2+xy-x2+xy}{xy}?$

$? =2?$

$解:原式?=\frac {2a+5-a+1+2a-3}{2(a+1)}?$

$? =\frac {3a+3}{2(a+1)}?$

$? =\frac {3}{2}?$

$解:原式?=\frac {8y}{12x2y}+\frac {9x2}{12x2y}-\frac {10x}{12x2y}?$

$? =\frac {8y+9x2-10x}{12x2y}?$

$解:原式?=\frac {20a3c}{24a2b2c2}-\frac {14ab3}{24a2b2c2}+\frac {33bc3}{24a2b2c2}?$

$? =\frac {20a3c-14ab3+33bc3}{24a2b2c2}?$

$解:原式?=\frac {(x-1)2}{x2-1}-\frac {(x+1)2}{x2-1}?$

$?=-\frac {4x}{x2-1}$

$解:原式?=\frac {a2-b2}{a(a-b)}?$

$?=\frac {(a+b)(a-b)}{a(a-b)}$

$=\frac {a+b}{a}?$

$解：原式?=\frac {a2}{ab}-\frac {b2}{ab}-\frac {a+b}{ab}?$

$?=-\frac {2b2}{ab}$

$=-\frac {2b}{a}?$

$解:原式?=\frac {a2-b2+2b2}{a+b}?$

$?=\frac {a2+b2}{a+b}?$

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