Question

Ex 3 ,foarte urgent!!!​

Answer 1

Răspuns:

0,2=2/10=1/5

0,25=25/10=1/4

0,(3)=3/9=1/3

a/(1/5)=b/(1/4)=c/(1/3)=k

a/5=b/4=c/3=k

a=5k

b=4k

c=3k

a+b+c=180

5k+4k+3k=180

12k=180=>k=180:12=>k=15

a=5·15=75

b=4·15=60

c=3·15=45

a²=b²+c²

75²=60²+45²

5625=3600+2025 (adevarat)