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第32頁(yè)

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D
B
2
-10
?$=-(2×7)+(6×9)$?
?$=-14+54$?
?$=40$?
?$=-4-6$?
?$=-10$?
?$=-28+3$?
?$=-25$?
?$=-4-6$?
?$=-10$?
?$=\frac {9}{4}×(-\frac {6}{7})÷(-\frac {3}{2})$?
?$=\frac {9}{4}×\frac {6}{7}×\frac {2}{3}$?
?$=\frac {9}{7}$?
?$=-\frac {2}{3}×\frac {1}{4}×\frac {1}{2}$?
?$=-\frac {1}{12}$?
?$=\frac {10}{3}×\frac {45}{4}×\frac {4}{27}×\frac {3}{10}$?
?$=\frac {5}{3}$?
?$=\frac {22}{7}×\frac {7}{22}×(\frac {22}{7}-\frac {22}{3})×\frac {21}{22}$?
?$=\frac {22}{7}×\frac {21}{22}-\frac {22}{3}×\frac {21}{22}$?
?$=3-7$?
?$=-4$?
?$=\frac {5}{4}×\frac {4}{5}×\frac {5}{4}×\frac {5}{4}$?
?$=\frac {25}{16}$?
?$=(-\frac {7}{8})÷(-\frac {7}{24})-\frac {7}{24}÷\frac {7}{8}$?
?$=3-\frac {1}{3}$?
?$=-2\frac {2}{3}$?
D
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