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2015-02-11T20:23:42+08:00

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n=7-(-12)*(-\frac{6}{9})+78 \\
n=7-(-12)*(-\frac{2}{3})+78 \\
n=7-[(-2)*(-4)]+78 \\
n=7-8+78 \\
n=-1+78 \\
\boxed{n=77}
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2015-02-13T16:28:56+08:00
Using MDAS rule ( Multiply, divide, add , subtract) multiply negative sign to -12. then it will become +12 . 12 multiply to +6 , it will become 72. Then divide 72 to 9 the answer is 8. 27+8+78=113 . Therefore n=113
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