Question

1)1/1/30+1/42 2)1/1/36-1/44 3)1/1/36+1/45 4)1/1/35-1/60 5)1/1/21+1/28
6)1/1/72-1/99 7)10*(1\5)^2-12*1/5 8)8*(1/4)^2-14*1/4 9)21*(1/7)^2-10*1/7 10)6*(1/3)^2-17*1/3 11)18*(1/9)^2-20*1/9 12)15*(1/5)^2-8*1/5 помогите плиз это срочно!!!

Answer 1

Ответ:

1)

$\frac{1}{30 } + \frac{1}{42} = \frac{2}{35}$

2)

$\frac{1}{36} - \frac{1}{44} = \frac{1}{198}$

3)

$\frac{1}{36} + \frac{1}{45} = \frac{1}{20}$

4)

$\frac{1}{36} - \frac{1}{60} = \frac{1}{84}$

5)

$\frac{1}{21} + \frac{1}{28} = \frac{1}{12}$

6)

$\frac{1}{72} - \frac{1}{99} = \frac{1}{264}$

7) 10×0,2^2-2,4=

$10 \times ( \frac{1}{5} ) {}^{2} - \frac{12}{5} =$

$10 \times \frac{1}{25} - \frac{12}{5} =$

$2 \times \frac{1}{5} - \frac{12}{5} =$

$\frac{2}{5} - \frac{12}{5} = - 2$

8)

$2 { }^{3} \times 0.25 {}^{2} - 3.5 =$

$2 {}^{3} \times 2 { - }^{4} - \frac{7}{2 = }$

$2 { - }^{1} - \frac{7}{2} = \frac{1}{2} - \frac{7}{2} = - 3$

9)

$21 \times (\frac{1}{7} ){}^{2} - \frac{1}{7} =$

$3 \times \frac{1}{7} - \frac{10}{7} = \frac{3}{7} - \frac{10}{7} = - 1$

10)

$6 \times \frac{1}{9} - \frac{17}{3} = 2 \times \frac{ 1}{3} - \frac{17}{3} = \frac{2}{3} - \frac{17}{3} = - 5$

11)

$18 \times ( \frac{1}{9} ) {}^{2} - \frac{20}{9 } = 18 \times \frac{1}{81} - \frac{20}{9} = \frac{2}{9} - \frac{20}{9} = - 2$

12

$15 \times 0.2 {}^{2} - 1.6 = 15 \times ( \frac{1}{5} ) {}^{2} - \frac{8}{5} = 15 \times \frac{1}{25} - \frac{8}{5} = 3 \times \frac{1}{5} - \frac{8}{5} = \frac{3}{5} - \frac{8}{5} = - 1$

я точно незнаю,но я старалась, простите если неправильно