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623)
2)
![frac{6.8 - 7 +8 }{5.4 - 6.7}
\\
5.4 - 6.7 = - 1.3\
6.8-7+8 = 6.8 + 1 = 7.8\\
frac{6.8 - 7 +8 }{5.4 - 6.7} = frac{7.8}{-1.3} = -6](https://tex.z-dn.net/?f=+frac%7B6.8+-+7+%2B8+%7D%7B5.4+-+6.7%7D%0A%5C%5C%0A5.4+-+6.7++%3D+-+1.3%5C%0A6.8-7%2B8+%3D+6.8+%2B+1+%3D+7.8%5C%5C%0A+frac%7B6.8+-+7+%2B8+%7D%7B5.4+-+6.7%7D+%3D++frac%7B7.8%7D%7B-1.3%7D+%3D+-6 "frac{6.8 - 7 +8 }{5.4 - 6.7}
\\
5.4 - 6.7 = - 1.3\
6.8-7+8 = 6.8 + 1 = 7.8\\
frac{6.8 - 7 +8 }{5.4 - 6.7} = frac{7.8}{-1.3} = -6")
4)
![frac{0.6*(-9) - 3.6}{-1.5*4}\\
0.6*(-9) - 3.6 = -5.4 -3.6 = -9\
-1.5*4 = -6\\
frac{0.6*(-9) - 3.6}{-1.5*4} = frac{-9}{-6} = 1.5](https://tex.z-dn.net/?f=+frac%7B0.6%2A%28-9%29+-+3.6%7D%7B-1.5%2A4%7D%5C%5C%0A0.6%2A%28-9%29+-+3.6+%3D+-5.4+-3.6+%3D+-9%5C%0A-1.5%2A4+%3D+-6%5C%5C%0Afrac%7B0.6%2A%28-9%29+-+3.6%7D%7B-1.5%2A4%7D+%3D+frac%7B-9%7D%7B-6%7D+%3D+1.5%0A+ "frac{0.6*(-9) - 3.6}{-1.5*4}\\
0.6*(-9) - 3.6 = -5.4 -3.6 = -9\
-1.5*4 = -6\\
frac{0.6*(-9) - 3.6}{-1.5*4} = frac{-9}{-6} = 1.5")
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