Question

Найдите сумму: 1)-7 +(-8);2)-0,38+(-0,74);3)-1,8+(-0,34);4)смешанное число - 46\7+(23\7);5)-5\6 +(-7\8);6)смешанное число-67\15 +(-83\10)

Answer 1

1) -15
2)-1,12
3)-2,14
4)$- \frac{23}{7} =-3 \frac{2}{7}$
5)$- \frac{5}{6} - \frac{7}{8} =- \frac{40}{48} - \frac{42}{48} = -\frac{82}{48} =- \frac{41}{24} =-1 \frac{17}{24}$
6)$- \frac{134}{30} - \frac{249}{30} = -\frac{383}{30} =-12 \frac{23}{30}$

Answer 2

1) -7 + (-8)

To find the sum of -7 and -8, simply add them together: -7 + (-8) = -15

2) -0.38 + (-0.74)

To find the sum of -0.38 and -0.74, simply add them together: -0.38 + (-0.74) = -1.12

3) -1.8 + (-0.34)

To find the sum of -1.8 and -0.34, simply add them together: -1.8 + (-0.34) = -2.14

4) смешанное число -46\7 + 23\7

To find the sum of the mixed number -46/7 and 23/7, first convert the mixed number to an improper fraction: -46/7 + 23/7 = (-46 + 23)/7 = -23/7

So, the sum of the mixed number -46/7 and 23/7 is -23/7.

5) -5/6 + (-7/8)

To find the sum of -5/6 and -7/8, first, find a common denominator, which is 24: -5/6 = -20/24 -7/8 = -21/24

Now, add the fractions together: -20/24 + (-21/24) = -41/24

So, the sum of -5/6 and -7/8 is -41/24.

6) смешанное число -67/15 + (-83/10)

To find the sum of the mixed number -67/15 and -83/10, first convert the mixed number to an improper fraction: -67/15 + (-83/10) = (-67/15) + (-249/30) = (-67/15) + (-249/30)

Now, find a common denominator, which is 30: -67/15 = -134/30 -249/30 = -249/30

Now, add the fractions together: -134/30 + (-249/30) = -383/30

So, the sum of the mixed number -67/15 and -83/10 is -383/30.