Question

Ma ajutati si pe mine va rog :?va rog din suflet

Answer 1

 ex.12
a) =(12/25·5/4):9/35   simplificam ce este in paranteza 
=(3/5·1/1):9/35
=3/5·35/9 simplif
=1/1·7/3=7/3

b) =12/25:(4/5·35/9)=
12/25:(4/1·7/9)
=12/25:28/9
=12/25·9/28=27/175

c)= (25/36·16/7):(60/49·7/162)
=(25/9·4/7):(10/7·1/27)
=100/63:10/189
=100/63·189/10=10/1·3/1=30

d) =(11/12·18/13):22/33
=(11/2·3/13):22/33
=33/26·33/22=1089/572

e) =(19/45·30/7):19/21
=(19/3·2/7):19/21
=38/21·21/19=38/19=2

f)= (13/12·15/7):39/70
=(13/4·5/7):39/70
=65/28·70/39=65/2·5/39=325/78

ex.13
a)={[(11·3+1·4)/24]·5/37}/{([11-3·2)/24]:5/10}
={[(33+4)/24]·5/37}/{[(11-6)/8]·10/5}
={37/24·5/37}/{5/8·10/5}  simplif ce se poate
={5/24}/{5/4}
=5/24:5/4=5/24·4/5=simplif=4/24=1/6

b) ={[(11·3+11·2)/72]·6/11}//[(11·3-5·2)/18]·5/23
={[(33+22)/·6/11}/{[(33-10)/18]·5/23}
={55/72·6/11)/{23/18·5/23)  simplif/12}/{5/18}
=5)//12:5/18=5/12·18/5=
ex.14.
a) =[(7/6)+(75/100)]:23/5+(583-58)/900    simplif
=[(7/6)+(3/4)]·5/23+525/900   simplif
=[(7·2+3·3)/12]·5/23+7/12
=[(14+9)/12]·5/23+7/12
=23/12·5/23+7/12
=5/12+7/12=12/12=1

b) =[5/6-6/9]:(16-1)/90
=[(5·3-6·2)/18:15/90
=[(15-12)/15]:1/6
=3/18·6/1=18/18=1