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1. 填空：
(1) $\frac{2bx^{2}}{4b^{2}x}=$ ;
(2) $\frac{y^{2}-3y}{5y}=$ ;
(3) $\frac{a + 2}{a^{2}-4}=$ ;
(4) $\frac{2x - 2}{x^{2}-1}=$ .
(1) $\frac{2bx^{2}}{4b^{2}x}=$ ;
(2) $\frac{y^{2}-3y}{5y}=$ ;
(3) $\frac{a + 2}{a^{2}-4}=$ ;
(4) $\frac{2x - 2}{x^{2}-1}=$ .
答案
1. (1) $2b$; (2) $y - 3$; (3) $a - 2$; (4) $2$
2. 分式$\frac{8a^{2}b^{2}c}{12b^{2}cd}$约分后等于________.
答案
2. $\frac{2a^{2}}{3d}$
3. 下列各式中，最简分式是( )．
A. $\frac{x + 2}{x - 2}$
B. $\frac{x^{2}-y^{2}}{(x + y)^{2}}$
C. $-\frac{ab}{b^{2}}$
D. $\frac{a + b}{a^{2}+ab}$
A. $\frac{x + 2}{x - 2}$
B. $\frac{x^{2}-y^{2}}{(x + y)^{2}}$
C. $-\frac{ab}{b^{2}}$
D. $\frac{a + b}{a^{2}+ab}$
答案
3. A
4. 约分：
(1) $\frac{x^{10}}{x^{5}y}$;
(2) $\frac{-8a^{2}b^{2}c}{18a^{3}b^{4}}$;
(3) $\frac{4a(a + b)^{2}}{12a^{2}(a + b)}$;
(4) $\frac{-21x(x - y)^{2}}{28x^{2}(x - y)^{4}}$.
(1) $\frac{x^{10}}{x^{5}y}$;
(2) $\frac{-8a^{2}b^{2}c}{18a^{3}b^{4}}$;
(3) $\frac{4a(a + b)^{2}}{12a^{2}(a + b)}$;
(4) $\frac{-21x(x - y)^{2}}{28x^{2}(x - y)^{4}}$.
答案
4. (1) $\frac{x^{5}}{y}$; (2) $\frac{-4a^{2}c}{9b}$; (3) $\frac{a + b}{3a}$; (4) $\frac{-3}{4x(x - y)^{2}}$
5. 约分：
(1) $\frac{a^{2}-1}{a^{2}+2a + 1}$;
(2) $\frac{4 - m}{m^{2}-16}$.
(1) $\frac{a^{2}-1}{a^{2}+2a + 1}$;
(2) $\frac{4 - m}{m^{2}-16}$.
答案
5. (1) $\frac{a - 1}{a + 1}$; (2) $-\frac{1}{m + 4}$
