Question

Ex 7 pls e incercuit am nevoie de ajutor plsssssssssssssssssssssssssssssssssssssssssss

Answer 1

$7.a)0,2(5):0,(5)= \frac{25-2}{90}: \frac{5}{9} =\frac{25-2}{90}\cdot \frac{9}{5}= \frac{23}{10} \cdot \frac{1}{5}= \frac{23}{50}$$b) 2,(3):\frac{5}{6} = \frac{23-2}{9}\cdot \frac{6}{5}= \frac{14}{5} \\ \\c) \frac{2}{9}:0,(3)= \frac{2}{9} : \frac{3}{9}= \frac{2}{9} \frac{9}{3} = \frac{2}{3} \\ \\d) \frac{69}{11} :2,(09)= \frac{69}{11}: \frac{209-2}{99} = \frac{69}{11}\cdot \frac{99}{207}= \frac{69\cdot9}{207} \\ \\e) 0,95: \frac{38}{20}= \frac{95}{100}\cdot \frac{20}{38} = \frac{1}{2}$

$f)0,8(2)}:0,(3)= \frac{82-8}{90} : \frac{3}{9}= \frac{74}{90}\cdot \frac{9}{3} = \frac{74}{30}$

Answer 2

a)   2,(3) : 5/6 = (23-2) /9 × 6/5 = 21/9  × 6/5 = 21/3 × 2/5 = 7 × 2/5 = 14/5 =
=  2 intregi si 4/5= 2,8

b)   2/9 : 3/9 =  2/9 × 9/3 = 2/3 =0,(6)

c)   69/11 : 2,(09)
2,(09) = (209 - 2) / 99 = 207 / 99 = 23/11
69/11 : 23/11 = 69/11 × 11/23 = 3/1=3
→ simplific pe 11 cu 11; pe 69 cu 23 = 3/1

d)   0,95 : 38/20 = 95/100 × 20/38 = 1/2
→simplfic pe 20 cu 100 =1/5; pe 95 cu 5 = 19; pe 19 cu 38 = 1/2

e)   (25 -2)/90 : 5/9 =  23/90 × 9/5 = 23/ ( 10×5) = 23/50 =0,46

f) 0,8(20 : 0,(2) = (82-8)/90 : 2/9 =  74/90 × 9/2 = 37/10 = 3,7
→simplific pe 9 cu 90 = 1/10; 74 cu 2 = 37