Question

Problemele 1,2,3 va rog!!!! e urgent

Answer 1

1)a=15+5/7 x651
A=15+5x93
A=15+465
A=480
Sfertul treimii:480:4:3=120:3=40

2)fie numerele x, y, z =>y=x+2,z=x+4
(x+y+z) x4=(x+x+2+x+4)x4=(3x+6)x4=12x+24(1)

(x+y+z) x4=4x+4y+z+900=4x+4(x+2)+x+4+900=4x+4x+8+x+4+900=9x+912 (2)

Din (1) si (2)=> 12x+24=9x+912
12x-9x=912-24
3x=888
X=296
Y=296+2=>y=298
Z=296+4=>z=300


3)[1+(2x7+56:7)]x3=(1+14+8)x3=23x3=69

[(1+2)x7+56]:7x3=(3x7+56):7x3=(21+56):7x3=77:7x3=11x3=33

[(1+2)x7+56:7]x3=(3x7+8)x3=(21+8)x3=29x3=87