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第75頁

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解：原式???$=\frac {a2}{b2}×\frac {25b2}{4a^4}×\frac {a}{5b}$???
???$ =\frac {25}{4a2}×\frac {a}{5b}$???
???$ =\frac {5}{4ab}$???
解：原式???$=(\frac {1}{a}+\frac {1})2÷[(\frac {1}{a}+\frac {1})(\frac {1}{a}-\frac {1})]$???
???$ =(\frac {1}{a}+\frac {1})÷(\frac {1}{a}-\frac {1})$???
???$ =\frac {a+b}{b-a}$???
解：原式??$=\frac {9x^4}{16y2}×\frac {2y}{3x}+\frac {x2}{2y2}×\frac {x}{2y2}$??
??$ =\frac {3x3}{8y}+\frac {x3}{4y^4}$??
??$ =\frac {3x3y3+2x^3}{8y^4}$??
解：原式???$=\frac {2}{3}×\frac {(a+b)2}{(a-b)2}×\frac {a-b}{a+b}-\frac {a2}{(a-b)(a+b)}×\frac {a}$???
???$ =\frac {2}{3}×\frac {a+b}{a-b}-\frac {ab}{(a-b)(a+b)}$???
???$ =\frac {2a2+ab+2b2}{3(a2-b2)}$???
解：原式???$=\frac {x+2y}{x+y}×\frac {xy}{x+2y}×\frac {xy}{x+y}$???
???$ =\frac {xy}{x+y}×\frac {xy}{x+y}$???
???$ =\frac {x^2y^2}{(x+y)2}$???
解：①原式?$=\frac {3x(x+2)-x(x-2)}{(x-2)(x+2)}×\frac {(2-x)(2+x)}{x}$?
?$ =\frac {2x2+8x}{(x-2)(x+2)}×\frac {(2-x)(2+x)}{x}$?
?$ =-2x-8$?
②原式?$=\frac {3x}{x-2}×\frac {4-x2}{x}+\frac {x}{x+2}×\frac {4-x2}{x}$?
?$ =-3(2+x)-(2-x)$?
?$ =-2x-8$?
解：原式???$=\frac {p2+m2+n2}{mnp}$???
解：原式???$=\frac {(c-a)2+(a-b)2+(b-c)2}{(a-b)(b-c)(c-a)}$???
解：設(shè)甲每小時做???$x$???個，則乙每小時做???$(x-5)$???個
由題意可得：???$\frac {90}{x}=\frac {60}{x-5}$???
解得???$x=15$???
所以甲每小時做???$15$???個，乙每小時做???$10$???個
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