Объяснение:
1) (4/25)+(15/4)=(4*4+15*25)/(25*4)=(16+375)/100=391/100=3,91.
3) (3/2)-(9/5)=(3*5-2*9)/(2*5)=(15-18)/10=-3/10=-0,3.
5) (6/5)*(3/4)=(6*3)/(5*4)=18/20=9/10=0,9.
7) (12/5):(15/2)=(12*2)/(5*15)=24/75=18/25=8*4/(25*4)=32/100=0,32.
9) 1/((1/36)+(1/45))=1/((5+4)/180)=180/9=20.
11) ((3/4)-(1/6))*3=((3*3-1*2)/12)*3=((9-2)/12)*3=(7/12)*3=7/4=1,75.
13) ((10/13)+(15/4))*(26/5)=((10*4+15*13)/52)*(26/5)=
=((40+195)/52)*(26/5)=(235/52)*(26/52)=(235*26/(52*5)=235/10=23,5.
Объяснение:
1) (4/25)+(15/4)=(4*4+15*25)/(25*4)=(16+375)/100=391/100=3,91.
3) (3/2)-(9/5)=(3*5-2*9)/(2*5)=(15-18)/10=-3/10=-0,3.
5) (6/5)*(3/4)=(6*3)/(5*4)=18/20=9/10=0,9.
7) (12/5):(15/2)=(12*2)/(5*15)=24/75=18/25=8*4/(25*4)=32/100=0,32.
9) 1/((1/36)+(1/45))=1/((5+4)/180)=180/9=20.
11) ((3/4)-(1/6))*3=((3*3-1*2)/12)*3=((9-2)/12)*3=(7/12)*3=7/4=1,75.
13) ((10/13)+(15/4))*(26/5)=((10*4+15*13)/52)*(26/5)=
=((40+195)/52)*(26/5)=(235/52)*(26/52)=(235*26/(52*5)=235/10=23,5.