вычислите: 1)-29-(-21); 2)-(-7,9)-8,6; 3)-(-8-14)-(-18+32); 4)-(-2 1/3-1 2/3)-(3 2/7-1 2/7). Created by gulsodahonalimova. matematika-ru

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вычислите: 1)-29-(-21); 2)-(-7,9)-8,6; 3)-(-8-14)-(-18+32); 4)-(-2 1/3-1 2/3)-(3 2/7-1 2/7)

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$- 29 + 21 = - 8 \\ 7.9 - 8.6 = - 0.7 \\ 8 + 14 + 18 - 32 = 8 \\ - ( - (2 \frac{1}{3} + 1 \frac{2}{3} ) + ( \frac{1}{3} + \frac{2}{3} ))) - 2 = - ( - ((2 + 1) + (\frac{1}{3} + \frac{2}{3} ))) - 2 = - ( - (3 + 1)) - 2 = - ( - 4) - 2 = 4 - 2 = 2$

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