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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 {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：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：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?$?
$?解：原式???=\frac {(c-a)2+(a-b)2+(b-c)2}{(a-b)(b-c)(c-a)}????$
?$解：設(shè)甲每小時做???x???個，則乙每小時做???(x-5)???個$?
?$由題意可得：???\frac {90}{x}=\frac {60}{x-5}???$?
?$解得???x=15???$?
?$所以甲每小時做???15???個，乙每小時做???10???個$?
$?解：原式???=\frac {p2+m2+n2}{mnp}????$
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