Question

ajutor vrg???!! dau 3p​

Answer 1

Explicație pas cu pas:

..7.

a) ( b+c) = a×b×c = 5/12+7/18=(15+14)/36=29/36

b) (a-b)×c =a×b×c =11/15-13/24=(11×8-13×5)/120=(88-65)/120=23/120

d) a×(b+c+d)=a×b+a×c+a×d=5/12+9/20+7/15=(5×5+9×3+7×4)/60=(25+27+28)/60=80/60=4/3

a×(b+c-d)=a×b+a×c-a×d=5/12+9/20-7/15=(5×5+9×3-7×4)/60=24/60=2/5

6a).(5/6+3/4)×24/19=20+18/24×24/19=38/24×24/19=2

b)1/6+7/9×18/17=1/6+7×2/17=1/6+14/17=101/102

c)(20/24+21/24)×18/41+1/4=41/24×18/41+1/4=738/984+1/4=738/984+246/984=984/984=1

e) 22/90-3/90×18/19=19/90×18/19=1/5

f)55/60-28/60×10/9+1/2=27/60×10/9+1/2=270/540+1/2=270/540+1/2=270/540+270/540=540/540=1

8. ( 5×2/12+3×3/12)×24/19-4/6-1/6)×4/3

= (10/12+9/12)×24/19-3/6×4/3=19/12×24/19-12/18=24/12-2/3=2-2/3=(6-2)/3=4/3