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2. 用合适的方法计算下列各题:
(1)$25×\frac {3}{4}-(-25)×\frac {1}{2}+25÷(-4);$ (2)$7×2.6+7×1.5-4.1×8;$
(3)$-6×(-\frac {15}{17})+14×(-\frac {15}{17})-9×(-\frac {15}{17});$
(4)$(3\frac {1}{8})^{12}×(\frac {8}{25})^{11}×(-2)^{3};$ (5)$48\frac {24}{25}÷(-48);$
(6)$(-\frac {5}{8})×(-4)^{2}-0.25×(-5)×(-4)^{3}.$
(1)$25×\frac {3}{4}-(-25)×\frac {1}{2}+25÷(-4);$ (2)$7×2.6+7×1.5-4.1×8;$
(3)$-6×(-\frac {15}{17})+14×(-\frac {15}{17})-9×(-\frac {15}{17});$
(4)$(3\frac {1}{8})^{12}×(\frac {8}{25})^{11}×(-2)^{3};$ (5)$48\frac {24}{25}÷(-48);$
(6)$(-\frac {5}{8})×(-4)^{2}-0.25×(-5)×(-4)^{3}.$
答案：
2.
(1)25
(2)-4.1
(3)$\frac{15}{17}$
(4)-25
(5)$-\frac{51}{50}$
(6)-90
(1)25
(2)-4.1
(3)$\frac{15}{17}$
(4)-25
(5)$-\frac{51}{50}$
(6)-90
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