Question

Ex 8 va rog!!Dau coroana

Answer 1

8a) ( 19-10/3×6/5):5=(19-2×2):5=(19-4):5=15:5=3
b) (1/2-1/3):1/12+7=(3-2)/6:1/12+7= 1/6×12+7=12/6+7=2+7=9
c)(5/4-2/3+1):7/12=(15-8+12)/12:7/12=
19/12×12/7=19/7
d) (1/2+2/3-3/4):1/6=
(6+8-9)/12:1/6=
5/12×6=5/2
e) 2/3-2/3×1/2=2/3-1/3=1/3
f) (9-2si2/3×2si1/7)×21/46=
(9-8/3×15/7)×21/46=(9-120/21)×21/46=
(189-120)/21×21/46=69/21×21/46=3/2
g) 3/4×(8/9-1/6):5/4=3/4×(16-3)/18:5/4=
3/4×13/18×4/5=13/6×1/5=13/30
h) (2-5/4)^2:3/4-1/2=((8-5)/4)^2:3/4-1/2=
(3/4)2×4/3-1/2=9/8×4/3-1/2=3/2-1/2=2/2=1
i) (2-4/3)^2:2/9=((6-4)/3)^2×9/2=(2/3)^2×9/2
4/9×9/2=2
j)(2/3-1/2):(1/6)^3=(4-3)/6:1/216=1/6×216=1×36=36
k) 10-10:(10/3)^3=10-10:30/27=10-10×27/30=
10-27/30=10-9/10=(100-9)/10=91/10