Question

Контрольная робота плис помогите 30 балов

Answer 1

Ответ:

1. 150,043

2. 75x-12x+x-24x=76x-36x=40x

3. 402+7982+1598=402+9580=9982

4. 398 - 100%

x - 110%

$x=\frac{398*110}{100}=\frac{398*11}{10}=\frac{4378}{10}=437,8$

5. 1) $\frac{17}{25} -\frac{9}{25} +\frac{4}{25} = \frac{12}{25}$   2) $10\frac{2}{19} - \frac{7}{19} = \frac{192}{19} -\frac{7}{19} = \frac{185}{19} = 9\frac{14}{19}$

6. 75% = $\frac{75}{100}$ = 0,75

96 : 0,75 = 128 (кг)

7. $2,45:(2x-1,4)=3,5 =\frac{49}{20}:(2x-\frac{7}{5}) = 3,5 = \frac{49}{20}:\frac{10x-7}{5} =3,5 = \frac{49}{20}*\frac{5}{10x-7}=3,5 = \frac{49}{4} *\frac{1}{10x-7}=3,5=\frac{49}{4(10x-7)}=3,5=14(10x-7)=49=140x-98=49=-98-49=-140x=-147=\frac{21}{20}$

8. (6,9+14,5):0,5+1,4*20=21,4:0,5+28=42,8+28=70,8