Question

помогите решить 1,3,5

Answer 1

1)
1/10+1/15=3/30+2/30=5/30=1/6
1/6×12 6/7=1/6×90/7=15/7=2 1/7
15 6/7-2 1/7=13 5/7

3)
12.8÷0.64=20
3.05÷0.05=61
20+61=81
8 2/3÷1 4/9=26/3÷13/9=26/3×9/13=6
6-1=5
81÷5=16.2

5)
1 1/3×0.27=1 1/3×27/100=4/3×27/100=9/25
3 1/3×0.15=3 1/3×15/100=3 1/3×3/20=
=10/3×3/20=1/2
9/25-1/2=18/50-25/50=-7/50=-0.14
(-0.1)^3=-0.001
-0.001×1500=-1.5
-0.14-1.5=-1.64

Answer 2

$15 \frac{6}{7} - 12 \frac{6}{7}( \frac{1}{10}+ \frac{1}{15}) = 13 \frac{5}{7} \\1. \frac{1}{10} + \frac{1}{15} = \frac{3}{30} + \frac{2}{30} = \frac{5}{30} = \frac{1}{6} \\2. 12 \frac{6}{7} * \frac{1}{6} = \frac{90}{7} * \frac{1}{6} = \frac{90*1}{7*6} = \frac{15}{7} = 2 \frac{1}{7} \\ 3. 15 \frac{6}{7} - 2 \frac{1}{7} = 13 \frac{5}{7}$

$\frac{12,8 : 0,64 + 3,05 : 0,05}{8 \frac{2}{3} : 1 \frac{4}{9} -1 } = 16,2 \\ 1. 12,8 : 0,64 = 20 \\ 2. 3,05 : 0,05 = 61 \\ 3. 20 + 61 = 81 \\ 4. 8 \frac{2}{3} : 1 \frac{4}{9} = \frac{26}{3} : \frac{13}{9} = \frac{26*9}{3*13} = 6 \\ 5. 6 - 1 = 5 \\ 6. 81 : 5 = 16 \frac{1}{5} = 16,2$

$(1 \frac{1}{3} * 0,27 - 3 \frac{1}{3} * 0,15) - 1500 * (-0,1)^{3} = -3,14\\1. 1 \frac{1}{3} * 0,27 = \frac{4}{3} * 0,27 = 0,36 \\ 2. 3 \frac{1}{3} * 0,15 = \frac{10}{3} * 0.15 = 5 \\ 3. 0,36-5=-4,64 \\ 4. 1500*(-0,001) = -1,5 \\ 5. -4,64-(-1,5) =-3,14$