va rog ajutati-ma! dau coroana. plzz

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Răspuns :

11. [tex]2 \frac{3}{45} [/tex] +15/75=(2*45+3)/45+1/5=93/45+1/5=93/45+9*1/9*5=93/45+9/45=102/45=34/15= [tex] 2\frac{4}{15} [/tex]
12. a+b=0,75+1/4=0,75+0,25=1
13. 13/10+2,7=1,3+2,7=4
11)  93 /45 +15 / 75= ( 5x93) / 225 + (3x15) / 225=465 /225 + 45 /225=
= 510 /225= 102 / 45 = 2 intregi si 12 /45
45=3²x5
75=3x 5²
cmmmc ( 45, 75) =3²x5²=225

12)  0,75=75/100 = 15/20 = 3/4
a+b=3/4+ 1/4 =4 /4 =1

13)  13/10 =1,3
1,3 + 2,7 = 4